| Mar'20 | Dec'19 | Sep'19 | Jun'19 | Mar'19 | Dec'18 | Sep'18 | Jun'18 | Mar'18 | Dec'17 | Sep'17 | Jun'17 | Mar'17 | Dec'16 | Sep'16 | Jun'16 | Mar'16 | Dec'15 | Sep'15 | Jun'15 | Mar'15 | Dec'14 | Sep'14 | Jun'14 | Mar'14 | Dec'13 | Sep'13 | Jun'13 | Mar'13 | Dec'12 | Sep'12 | Jun'12 | Mar'12 | Dec'11 | Sep'11 | Jun'11 | Mar'11 | Dec'10 | Sep'10 | Jun'10 | Mar'10 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Cash flows from operating activities: | ||||||||||||||||||||||||||||||||||||||||
Net income | ||||||||||||||||||||||||||||||||||||||||
153,916 | 166,944 | 173,011 | 181,481 | 176,427 | 168,148 | 254,719 | 229,722 | 214,677 | 202,889 | 83,566 | 79,969 | 75,056 | 79,129 | 93,966 | 107,122 | 120,664 | 123,714 | 119,775 | 113,669 | 107,453 | 98,650 | 88,116 | 83,405 | 83,613 | 86,785 | 90,591 | 94,460 | 99,300 | 103,034 | 106,421 | 110,871 | 107,709 | 102,757 | 97,504 | 92,084 | 85,496 | 80,039 | 0 | 0 | 0 |
Adjustments to reconcile net income to net cash provided by operating activities: | ||||||||||||||||||||||||||||||||||||||||
Depreciation | ||||||||||||||||||||||||||||||||||||||||
257,605 | 249,527 | 244,528 | 240,290 | 235,404 | 230,151 | 225,459 | 220,655 | 217,809 | 217,639 | 219,498 | 217,701 | 214,900 | 209,728 | 202,993 | 200,293 | 197,653 | 193,209 | 188,171 | 183,272 | 179,581 | 176,984 | 177,587 | 176,017 | 173,811 | 173,019 | 170,189 | 169,478 | 168,617 | 166,957 | 163,551 | 161,847 | 159,587 | 158,634 | 158,555 | 155,450 | 153,675 | 152,242 | 0 | 0 | 0 |
Deferred income taxes | ||||||||||||||||||||||||||||||||||||||||
13,064 | 16,401 | 20,993 | 22,513 | 32,641 | 37,694 | -82,326 | -90,931 | -98,903 | -100,948 | 27,351 | 27,263 | 41,655 | 44,632 | 65,632 | 65,160 | 47,138 | 38,442 | 17,827 | 12,694 | 9,046 | 5,038 | -16,177 | -14,684 | -9,500 | -8,389 | -9,566 | -7,938 | -11,537 | -9,068 | 14,774 | 29,554 | 44,390 | 57,863 | 27,658 | 28,076 | 8,303 | -11,921 | 0 | 0 | 0 |
Gain on disposal of property and equipment | ||||||||||||||||||||||||||||||||||||||||
18,097 | 21,557 | 23,506 | 23,935 | 28,119 | 24,898 | 16,689 | 14,290 | 8,114 | 6,798 | 9,213 | 10,139 | 14,459 | 16,432 | 17,610 | 21,196 | 21,101 | 23,240 | 23,873 | 21,636 | 20,117 | 19,260 | 17,974 | 16,177 | 17,522 | 16,408 | 17,436 | 20,133 | 19,319 | 20,533 | 20,634 | 21,314 | 21,262 | 21,290 | 19,275 | 14,680 | 9,571 | 5,907 | 0 | 0 | 0 |
Non-cash equity compensation | ||||||||||||||||||||||||||||||||||||||||
8,432 | 8,077 | 8,233 | 8,370 | 8,035 | 7,394 | 6,838 | 5,904 | 5,060 | 4,546 | 3,271 | 3,401 | 3,592 | 2,381 | 3,079 | 1,617 | 2,276 | 4,361 | 5,327 | 6,988 | 6,536 | 6,070 | 5,330 | 5,056 | 4,812 | 4,809 | 5,057 | 4,959 | 4,781 | 4,602 | 4,096 | 3,685 | 3,112 | 2,599 | 2,374 | 2,101 | 1,586 | 1,461 | 0 | 0 | 0 |
Insurance and claims accruals, net of current portion | ||||||||||||||||||||||||||||||||||||||||
-14,221 | -14,188 | -21,310 | -24,456 | -32,220 | -26,570 | -22,140 | -11,741 | 2,400 | 5,605 | 6,895 | 6,115 | 9,985 | 11,320 | 15,770 | 13,820 | 7,900 | -1,750 | 930 | 1,705 | 1,855 | 8,455 | -2,625 | -4,850 | -2,750 | -6,400 | -7,000 | -6,450 | -5,200 | -4,250 | -950 | -3,200 | -7,500 | -8,000 | -2,500 | -1,250 | -750 | 250 | 0 | 0 | 0 |
Other | ||||||||||||||||||||||||||||||||||||||||
-524 | -3,360 | -4,220 | -5,344 | -5,743 | -4,774 | -8,283 | -6,546 | -9,839 | -11,957 | -3,625 | -6,364 | -2,261 | -3,370 | -4,685 | 1,705 | 4,287 | 9,103 | 9,876 | 3,713 | 714 | 1,107 | -2,783 | -992 | -125 | -541 | -2,842 | 243 | 939 | -237 | 1,137 | -1,378 | -2,940 | -1,073 | -1,791 | -566 | 1,234 | 592 | 0 | 0 | 0 |
Changes in certain working capital items: | ||||||||||||||||||||||||||||||||||||||||
Accounts receivable, net | ||||||||||||||||||||||||||||||||||||||||
-2,624 | -15,081 | -1,536 | -1,895 | 11,557 | 33,753 | 45,195 | 82,732 | 54,932 | 42,802 | 27,204 | 11,294 | 11,272 | 10,349 | 1,634 | -19,715 | -10,590 | -15,704 | -13,528 | -2,482 | 2,059 | 35,080 | 27,548 | 37,315 | 25,284 | 20,514 | 19,100 | 4,355 | 5,809 | -7,579 | 4,253 | 6,385 | 2,636 | 28,448 | 12,020 | 21,445 | 26,463 | 9,524 | 0 | 0 | 0 |
Other current assets | ||||||||||||||||||||||||||||||||||||||||
-6,954 | -975 | -5,223 | 6,742 | 9,083 | 9,979 | 10,829 | 245 | -14,224 | -20,173 | -35,359 | -20,743 | -1,508 | -2,245 | 31,738 | 13,418 | -2,100 | -9,455 | -2,028 | -561 | 3,915 | 25,926 | -4,422 | -9,149 | 4,408 | -3,398 | 3,206 | 12,142 | -5,930 | -17,581 | 388 | -3,579 | 6,603 | 21,744 | -3,578 | 12,940 | 1,077 | 1,218 | 0 | 0 | 0 |
Accounts payable | ||||||||||||||||||||||||||||||||||||||||
-10,825 | -7,537 | -4,715 | 2,368 | 7,379 | 7,559 | 10,466 | 14,817 | 11,522 | 5,831 | -63 | -7,140 | -7,954 | -5,272 | -1,009 | -5,371 | -1,151 | 7,256 | -15,690 | 3,519 | -682 | -1,497 | 13,250 | 4,866 | 4,787 | 2,793 | 3,962 | -2,159 | -11,950 | -20,172 | 2,417 | 4,938 | 12,615 | 19,381 | 9,010 | 10,709 | 10,621 | 10,839 | 0 | 0 | 0 |
Other current liabilities | ||||||||||||||||||||||||||||||||||||||||
-6,119 | -12,095 | 5,438 | 10,692 | 19,462 | 14,047 | 5,810 | -1,309 | 7,658 | -140 | 9,674 | 9,109 | 13,492 | 18,291 | -4,429 | 6,035 | -13,831 | -9,362 | 8,087 | 6,035 | -6,360 | 8,934 | -271 | -2,081 | 2,126 | 1,105 | 2,823 | -1,657 | 11,551 | 1,103 | -5,215 | -2,349 | -6,793 | -12,199 | 5,482 | -5,942 | -7,233 | 12,130 | 0 | 0 | 0 |
Net cash provided by operating activities | ||||||||||||||||||||||||||||||||||||||||
421,251 | 426,644 | 447,831 | 456,044 | 457,066 | 418,159 | 362,110 | 286,786 | 296,762 | 282,828 | 331,719 | 317,134 | 304,272 | 309,663 | 288,795 | 347,842 | 340,725 | 370,392 | 324,126 | 309,592 | 268,342 | 206,565 | 226,577 | 212,094 | 215,060 | 232,457 | 227,472 | 227,206 | 247,703 | 255,096 | 262,856 | 286,248 | 294,679 | 264,480 | 273,575 | 234,097 | 217,321 | 228,483 | 0 | 0 | 0 |
Cash flows from investing activities: | ||||||||||||||||||||||||||||||||||||||||
Additions to property and equipment | ||||||||||||||||||||||||||||||||||||||||
357,622 | 420,748 | 482,517 | 502,959 | 545,992 | 519,872 | 523,026 | 446,494 | 367,921 | 316,343 | 355,326 | 350,809 | 457,073 | 537,838 | 505,008 | 550,990 | 468,786 | 454,097 | 427,770 | 412,867 | 374,520 | 296,649 | 267,794 | 246,433 | 210,274 | 211,329 | 208,332 | 197,378 | 220,907 | 284,942 | 320,370 | 314,003 | 360,679 | 302,340 | 264,866 | 234,451 | 197,016 | 176,057 | 0 | 0 | 0 |
Proceeds from sales of property and equipment | ||||||||||||||||||||||||||||||||||||||||
138,271 | 136,873 | 151,176 | 166,469 | 169,162 | 170,900 | 155,996 | 138,789 | 128,164 | 117,498 | 98,628 | 115,753 | 114,475 | 108,231 | 110,620 | 98,387 | 100,565 | 102,614 | 111,206 | 103,974 | 93,407 | 84,355 | 75,507 | 66,239 | 63,618 | 59,413 | 57,184 | 59,848 | 57,223 | 60,015 | 61,525 | 65,819 | 65,986 | 70,142 | 75,330 | 61,793 | 68,803 | 57,024 | 0 | 0 | 0 |
Decrease in notes receivable | ||||||||||||||||||||||||||||||||||||||||
10,456 | 11,566 | 14,299 | 15,676 | 18,380 | 20,898 | 20,246 | 20,274 | 18,775 | 20,037 | 20,983 | 22,546 | 23,165 | 19,353 | 21,568 | 20,626 | 19,134 | 19,517 | 15,211 | 13,502 | 15,401 | 14,390 | 14,719 | 14,316 | 11,248 | 10,679 | 11,103 | 10,190 | 9,696 | 8,122 | 7,250 | 6,897 | 6,706 | 7,354 | 5,618 | 5,297 | 4,744 | 4,699 | 0 | 0 | 0 |
Net cash used in investing activities | ||||||||||||||||||||||||||||||||||||||||
-208,895 | -272,309 | -317,042 | -320,814 | -361,750 | -331,374 | -350,084 | -295,731 | -225,982 | -183,808 | -240,715 | -212,510 | -319,433 | -410,254 | -376,400 | -435,557 | -352,667 | -335,546 | -303,593 | -297,631 | -271,295 | -203,487 | -180,911 | -168,242 | -134,429 | -140,258 | -139,066 | -127,340 | -153,988 | -216,805 | -251,595 | -241,287 | -287,987 | -224,844 | -183,918 | -167,361 | -123,469 | -114,334 | 0 | 0 | 0 |
Cash flows from financing activities: | ||||||||||||||||||||||||||||||||||||||||
Repayments of short-term debt | ||||||||||||||||||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | 45,000 | 45,000 | 65,000 | 40,000 | 20,000 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | 20,000 | 40,000 | 60,000 | 100,000 | 160,000 | 170,000 | 150,000 | 110,000 | 50,000 | 60,000 | 60,000 | 60,000 | 50,000 | 0 | 0 | 0 |
Proceeds from issuance of short-term debt | ||||||||||||||||||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 180,000 | 170,000 | 150,000 | 110,000 | 50,000 | 60,000 | 60,000 | 60,000 | 50,000 | 0 | 0 | 0 |
Repayments of long-term debt | ||||||||||||||||||||||||||||||||||||||||
0 | - | - | - | 0 | - | - | - | - | 60,000 | 60,000 | 100,000 | 70,000 | 40,000 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | 40,000 | 30,000 | 30,000 | 30,000 | 0 | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Change in net checks issued in excess of cash balances | ||||||||||||||||||||||||||||||||||||||||
- | - | - | - | - | -21,539 | -239 | 13,697 | 0 | 21,539 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | -6,671 | 0 | 0 | 7,407 | 6,671 | 0 | 0 | 0 | - | - | - | - |
Dividends on common stock | ||||||||||||||||||||||||||||||||||||||||
286,082 | 286,190 | 286,370 | 286,607 | 24,285 | 23,013 | 21,668 | 20,261 | 19,522 | 18,784 | 18,044 | 17,309 | 17,299 | 17,289 | 17,280 | 16,551 | 15,833 | 15,115 | 14,388 | 14,392 | 14,406 | 14,440 | 14,479 | 14,516 | 14,561 | 14,587 | 124,423 | 124,432 | 124,411 | 124,391 | 50,987 | 50,983 | 50,979 | 50,969 | 130,771 | 130,749 | 130,713 | 130,676 | 0 | 0 | 0 |
Repurchases of common stock | ||||||||||||||||||||||||||||||||||||||||
30,554 | 42,301 | 68,053 | 91,582 | 92,710 | 72,165 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | 30,587 | 30,587 | 30,597 | 32,940 | 20,060 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - |
Tax withholding related to net share settlements of restricted stock awards | ||||||||||||||||||||||||||||||||||||||||
4,650 | 1,899 | 1,883 | 1,881 | 1,883 | 1,371 | 1,866 | 1,951 | 1,958 | 1,632 | 1,654 | 1,633 | 1,633 | 1,832 | 1,886 | 1,890 | 1,896 | 1,724 | 2,342 | 2,339 | 2,345 | 1,977 | 1,340 | 1,669 | 1,647 | 1,804 | 1,088 | 840 | 831 | 674 | 0 | 0 | 0 | - | - | - | - | - | - | - | - |
Stock options exercised | ||||||||||||||||||||||||||||||||||||||||
- | - | - | - | - | 476 | 598 | 1,721 | 2,166 | 2,461 | 2,411 | 1,173 | 795 | 370 | 298 | 268 | 242 | 846 | 3,689 | 3,625 | 4,582 | 7,012 | 5,748 | 5,965 | 5,461 | 2,548 | 6,625 | 6,389 | 6,080 | 6,035 | 693 | 934 | 1,213 | 2,940 | 2,921 | 5,604 | 7,934 | 7,980 | 0 | 0 | 0 |
Excess tax benefits from equity compensation | ||||||||||||||||||||||||||||||||||||||||
- | - | - | - | - | - | - | - | - | - | - | - | - | 238 | 320 | 341 | 351 | 556 | 1,248 | 1,239 | 1,292 | 1,324 | 621 | 639 | 593 | 379 | 181 | 152 | 144 | 150 | 28 | 156 | 298 | 605 | 622 | 1,869 | 3,127 | 3,422 | 0 | 0 | 0 |
Net cash used in financing activities | ||||||||||||||||||||||||||||||||||||||||
-196,115 | -155,219 | -125,532 | -98,539 | -68,631 | -67,612 | -19,588 | -9,678 | -74,314 | -101,416 | -91,159 | -94,456 | 34,003 | 83,370 | 56,000 | 55,992 | -26,691 | -24,992 | -21,348 | 8,593 | 6,416 | -3,668 | -15,037 | -40,178 | -43,094 | -83,524 | -88,765 | -93,796 | -86,425 | -35,551 | -50,412 | -49,893 | -42,061 | -40,753 | -127,228 | -123,276 | -119,652 | -119,274 | 0 | 0 | 0 |
Effect of exchange rate fluctuations on cash | ||||||||||||||||||||||||||||||||||||||||
-1,722 | 396 | -553 | -195 | -732 | -374 | -319 | -610 | 23 | 50 | 701 | 503 | -201 | -384 | -580 | -531 | -220 | -625 | -862 | -777 | -668 | -484 | -381 | -208 | -598 | -425 | -328 | -6 | 167 | 276 | 303 | -367 | -158 | -437 | -392 | 830 | 340 | 661 | 0 | 0 | 0 |
Net increase in cash, cash equivalents and restricted cash | ||||||||||||||||||||||||||||||||||||||||
14,519 | -488 | 4,704 | 36,496 | 25,953 | 18,799 | -7,881 | -19,233 | -3,511 | -2,346 | 546 | 10,671 | 18,641 | -17,605 | -32,185 | -32,254 | -38,853 | 9,229 | -1,677 | 19,777 | 2,795 | -1,074 | 30,248 | 3,466 | 36,939 | 8,250 | -687 | 6,064 | 7,457 | 3,016 | -38,848 | -5,299 | -35,527 | -1,554 | -37,963 | -55,710 | -25,460 | -4,464 | 0 | 0 | 0 |
Supplemental disclosures of cash flow information: | ||||||||||||||||||||||||||||||||||||||||
Interest paid | ||||||||||||||||||||||||||||||||||||||||
7,388 | 6,441 | 5,352 | 3,548 | 3,073 | 2,690 | 2,186 | 1,951 | 2,096 | 2,491 | 2,636 | 2,910 | 2,852 | 2,470 | 2,238 | 1,984 | 1,990 | 1,978 | 2,094 | 1,653 | 1,197 | 820 | 409 | 437 | 403 | 466 | 381 | 300 | 272 | 245 | 267 | 254 | 198 | 85 | 73 | 73 | 66 | 47 | 0 | 0 | 0 |
Income taxes paid | ||||||||||||||||||||||||||||||||||||||||
49,654 | 49,599 | 46,061 | 42,697 | 11,610 | 11,355 | 12,601 | 23,083 | 22,011 | 22,088 | 16,235 | 4,903 | 3,963 | 4,673 | 5,261 | 21,581 | 34,826 | 35,205 | 51,980 | 52,130 | 76,972 | 76,849 | 70,679 | 67,848 | 63,596 | 66,032 | 73,067 | 82,541 | 70,655 | 67,968 | 54,262 | 34,653 | 24,154 | 28,802 | 28,892 | 45,481 | 60,651 | 56,050 | 0 | 0 | 0 |
Supplemental schedule of non-cash investing and financing activities: | ||||||||||||||||||||||||||||||||||||||||
Notes receivable issued upon sale of property and equipment | ||||||||||||||||||||||||||||||||||||||||
5,771 | 6,764 | 10,628 | 13,056 | 13,054 | 13,140 | 9,812 | 7,033 | 7,122 | 5,816 | 6,555 | 9,305 | 12,270 | 25,449 | 37,220 | 42,254 | 44,194 | 36,060 | 26,750 | 20,601 | 16,850 | 14,385 | 13,836 | 16,205 | 17,073 | 17,110 | 15,979 | 13,209 | 12,536 | 10,564 | 10,405 | 11,600 | 9,661 | 9,172 | 7,153 | 4,357 | 4,821 | 4,607 | 0 | 0 | 0 |
Change in fair value of interest rate swaps | ||||||||||||||||||||||||||||||||||||||||
-6,143 | -651 | -1,773 | -328 | -128 | 255 | 642 | 737 | 663 | 599 | 1,188 | 1,476 | 1,286 | 337 | 93 | -900 | -406 | 242 | -1,117 | -943 | -1,267 | -1,180 | 0 | 0 | 0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
Property and equipment acquired included in accounts payable | ||||||||||||||||||||||||||||||||||||||||
19,936 | 21,138 | 20,798 | 15,177 | 25,799 | 16,748 | 7,532 | 6,710 | 8,555 | 3,227 | 1,545 | -5,816 | -4,695 | 1,874 | -9,065 | 3,564 | 7,282 | 627 | 12,120 | 1,627 | 2,145 | 2,067 | 3,167 | 10,924 | 5,885 | 5,403 | -5,186 | -5,546 | -13,131 | 109 | 20,994 | 23,195 | 27,806 | 17,026 | 0 | 0 | 0 | - | - | - | - |
Property and equipment disposed included in other receivables | ||||||||||||||||||||||||||||||||||||||||
19,779 | 18,600 | 1,153 | 409 | 679 | 674 | 361 | 816 | 710 | 654 | 1,196 | -348 | -310 | 155 | 280 | 627 | 429 | 21 | -351 | -696 | -401 | 0 | 89 | 26 | -113 | 434 | 596 | 828 | 984 | 311 | -879 | -3,691 | -77 | 258 | 0 | 0 | 0 | - | - | - | - |