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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Revenues $ 2,609,307 $ 2,042,186 $ 6,987,851 $ 5,548,353
Cost of services (including depreciation) 2,258,676 1,739,604 6,068,867 4,842,241
Gross profit 350,631 302,582 918,984 706,112
Selling, general and administrative expenses 201,224 164,325 571,656 479,456
Amortization of intangible assets 8,979 8,094 22,035 23,730
Operating income 140,428 130,163 325,293 202,926
Interest expense (6,058) (3,726) (14,294) (10,898)
Interest income 196 874 647 2,031
Other income (expense), net (2,371) 752 (3,814) (270)
Income from continuing operations before income taxes 132,195 128,063 307,832 193,789
Provision for income taxes 42,346 54,516 105,183 82,654
Net income from continuing operations 89,849 73,547 202,649 111,135
Net income from discontinued operations 0 605 0 605
Net income 89,849 74,152 202,649 111,740
Less: Net income attributable to non-controlling interests 536 410 1,232 940
Net income attributable to common stock 89,313 73,742 201,417 110,800
Amounts attributable to common stock:        
Net income from continuing operations 89,313 73,137 201,417 110,195
Net income from discontinued operations 0 605 0 605
Net income attributable to common stock $ 89,313 $ 73,742 $ 201,417 $ 110,800
Basic earnings per share attributable to common stock:        
Continuing operations (in usd per share) $ 0.57 $ 0.47 $ 1.29 $ 0.70
Discontinued operations (in usd per share) 0.00 0.01 0.00 0.00
Net income attributable to common stock (in usd per share) $ 0.57 $ 0.48 $ 1.29 $ 0.70
Weighted average basic shares outstanding (in shares) 157,484 155,024 155,796 158,090
Diluted earnings per share attributable to common stock:        
Continuing operations (in usd per share) $ 0.56 $ 0.47 $ 1.28 $ 0.70
Discontinued operations (in usd per share) 0.00 0.01 0.00 0.00
Net income attributable to common stock (in usd per share) $ 0.56 $ 0.48 $ 1.28 $ 0.70
Weighted average diluted shares outstanding (in shares) 158,620 155,024 156,793 158,090