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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Revenues $ 2,042,186 $ 1,939,438 $ 5,548,353 $ 5,673,164
Cost of services (including depreciation) 1,739,604 1,704,223 4,842,241 4,972,538
Gross profit 302,582 235,215 706,112 700,626
Selling, general and administrative expenses 164,325 145,687 479,456 441,073
Amortization of intangible assets 8,094 8,650 23,730 25,674
Operating income 130,163 80,878 202,926 233,879
Interest expense (3,726) (2,021) (10,898) (5,096)
Interest income 874 346 2,031 1,118
Equity in losses of unconsolidated affiliates (89)   (648) (314)
Other income (expense), net 841 (1,070) 378 (1,416)
Income from continuing operations before income taxes 128,063 78,133 193,789 228,171
Provision for income taxes 54,516 32,389 82,654 94,574
Net income from continuing operations 73,547 45,744 111,135 133,597
Net income from discontinued operations 605 173,212 605 193,109
Net income 74,152 218,956 111,740 326,706
Less: Net income attributable to non-controlling interests 410 2,568 940 10,725
Net income attributable to common stock 73,742 216,388 110,800 315,981
Amounts attributable to common stock:        
Net income from continuing operations 73,137 43,176 110,195 122,872
Net income from discontinued operations 605 173,212 605 193,109
Net income attributable to common stock $ 73,742 $ 216,388 $ 110,800 $ 315,981
Earnings per share attributable to common stock - basic and diluted:        
Continuing operations $ 0.47 $ 0.23 $ 0.70 $ 0.59
Discontinued operations 0.01 0.92   0.94
Net income attributable to common stock $ 0.48 $ 1.15 $ 0.70 $ 1.53
Shares used in computing earnings per share:        
Weighted average basic shares outstanding 155,024 188,951 158,090 206,181
Weighted average diluted shares outstanding 155,024 188,961 158,090 206,193