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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]        
Revenues $ 3,352,895 $ 2,985,281 $ 8,999,353 $ 8,059,205
Cost of services (including depreciation) 2,879,450 2,559,451 7,842,422 6,998,956
Gross profit 473,445 425,830 1,156,931 1,060,249
Selling, general and administrative expenses 245,010 224,040 700,862 645,566
Amortization of intangible assets 15,264 10,623 40,544 31,535
Change in fair value of contingent consideration liabilities 3,777 (1,394) 8,064 (7,673)
Operating income 209,394 192,561 407,461 390,821
Interest expense (18,369) (9,219) (48,066) (25,175)
Interest income 186 322 762 1,128
Other income (expense), net 717 (15,498) 66,197 (37,899)
Income before income taxes 191,928 168,166 426,354 328,875
Provision for income taxes 54,906 43,267 139,838 90,659
Net income 137,022 124,899 286,516 238,216
Less: Net income attributable to non-controlling interests 954 348 2,616 1,686
Net income attributable to common stock $ 136,068 $ 124,551 $ 283,900 $ 236,530
Earnings per share attributable to common stock:        
Basic (in dollars per share) $ 0.93 $ 0.82 $ 1.95 $ 1.54
Diluted (in dollars per share) $ 0.92 $ 0.81 $ 1.93 $ 1.52
Shares used in computing earnings per share:        
Weighted average basic shares outstanding (in shares) 145,913 152,562 145,654 154,087
Weighted average diluted shares outstanding (in shares) 147,438 153,687 147,074 155,198
Cash dividends declared per common share (in dollars per share) $ 0.04 $ 0 $ 0.12 $ 0