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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Revenues $ 2,839,199 $ 2,656,348 $ 5,646,458 $ 5,073,924
Cost of services (including depreciation) 2,519,694 2,322,977 4,962,972 4,439,505
Gross profit 319,505 333,371 683,486 634,419
Selling, general and administrative expenses 223,944 206,104 455,852 421,526
Amortization of intangible assets 12,610 10,507 25,280 20,912
Change in fair value of contingent consideration liabilities 4,371 (6,279) 4,287 (6,279)
Operating income 78,580 123,039 198,067 198,260
Interest expense (15,821) (9,178) (29,697) (15,956)
Interest income 267 660 576 806
Other income (expense), net 6,521 (10,426) 65,480 (22,401)
Income before income taxes 69,547 104,095 234,426 160,709
Provision for income taxes 41,088 29,389 84,932 47,392
Net income 28,459 74,706 149,494 113,317
Less: Net income attributable to non-controlling interests 1,115 341 1,662 1,338
Net income attributable to common stock $ 27,344 $ 74,365 $ 147,832 $ 111,979
Earnings per share attributable to common stock:        
Basic (in dollars per share) $ 0.19 $ 0.49 $ 1.02 $ 0.72
Diluted (in dollars per share) $ 0.19 $ 0.48 $ 1.01 $ 0.72
Shares used in computing earnings per share:        
Weighted average basic shares outstanding (in shares) 145,935 153,325 145,525 154,906
Weighted average diluted shares outstanding (in shares) 147,241 154,595 146,865 156,112
Cash dividends declared per common share (in dollars per share) $ 0.04 $ 0 $ 0.08 $ 0