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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Revenues $ 2,764,095 $ 2,807,259
Cost of services (including depreciation) 2,431,899 2,443,278
Gross profit 332,196 363,981
Selling, general and administrative expenses 230,793 231,908
Amortization of intangible assets 17,908 12,670
Change in fair value of contingent consideration liabilities 2,758 (84)
Operating income 80,737 119,487
Interest expense (14,006) (13,876)
Interest income 759 309
Other income (expense), net (9,827) 58,959
Income before income taxes 57,663 164,879
Provision for income taxes 16,160 43,844
Net income 41,503 121,035
Less: Net income attributable to non-controlling interests 2,817 547
Net income attributable to common stock $ 38,686 $ 120,488
Earnings per share attributable to common stock:    
Basic (in dollars per share) $ 0.27 $ 0.83
Diluted (in dollars per share) $ 0.26 $ 0.82
Shares used in computing earnings per share:    
Weighted average basic shares outstanding (in shares) 144,454 145,110
Weighted average diluted shares outstanding (in shares) 146,787 146,458
Cash dividends declared per common share (in dollars per share) $ 0.05 $ 0.04