| Dec'19 | Dec'18 | Dec'17 | ||||
|---|---|---|---|---|---|---|
Operating revenues | ||||||
Revenues | ||||||
1,436 | 1,326 | 1,219 | ||||
Operating Expenses [Abstract] | ||||||
Cost of services (exclusive of depreciation and amortization) | ||||||
888 | 821 | 778 | ||||
Selling, General and Administrative Expense | ||||||
142 | 123 | 113 | ||||
Depreciation, Depletion and Amortization | ||||||
88 | 97 | 93 | ||||
Total operating expenses | ||||||
1,119 | 1,042 | 984 | ||||
Operating profit | ||||||
317 | 284 | 234 | ||||
Interest Expense | ||||||
55 | 38 | 38 | ||||
Other Nonoperating Income (Expense) | ||||||
0 | 0 | 0 | ||||
Income before income taxes | ||||||
262 | 246 | 197 | ||||
Income Tax Expense (Benefit) | ||||||
69 | 62 | 35 | ||||
Net income | ||||||
193 | 183 | 161 | ||||
Net income per share | ||||||
Basic (in dollars per share) | ||||||
1.45 | 1.38 | 1.21 | ||||
Diluted (in dollars per share) | ||||||
1.44 | 1.37 | 1.20 | ||||