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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement [Abstract]        
Revenues $ 3,020,161 $ 3,352,895 $ 8,290,487 $ 8,999,353
Cost of services (including depreciation) 2,512,647 2,879,450 7,095,513 7,842,422
Gross profit 507,514 473,445 1,194,974 1,156,931
Equity in earnings of integral unconsolidated affiliates 5,120 0 6,165 0
Selling, general and administrative expenses (250,654) (245,010) (709,299) (700,862)
Amortization of intangible assets (19,687) (15,264) (55,374) (40,544)
Change in fair value of contingent consideration liabilities (78) (3,777) (598) (8,064)
Operating income 242,215 209,394 435,868 407,461
Interest expense (11,049) (18,369) (33,709) (48,066)
Interest income 80 186 1,114 762
Other income (expense), net 2,931 717 (3,649) 66,197
Income before income taxes 234,177 191,928 399,624 426,354
Provision for income taxes 70,477 54,906 119,626 139,838
Net income 163,700 137,022 279,998 286,516
Less: Net income attributable to non-controlling interests 787 954 4,453 2,616
Net income attributable to common stock $ 162,913 $ 136,068 $ 275,545 $ 283,900
Earnings per share attributable to common stock:        
Basic (in dollars per share) $ 1.16 $ 0.93 $ 1.95 $ 1.95
Diluted (in dollars per share) $ 1.13 $ 0.92 $ 1.90 $ 1.93
Shares used in computing earnings per share:        
Weighted average basic shares outstanding (in shares) 140,542 145,913 141,610 145,654
Weighted average diluted shares outstanding (in shares) 144,363 147,438 144,985 147,074