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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Revenues $ 7,572,436 $ 7,747,229 $ 6,411,577
Cost of services (including depreciation) 6,648,771 6,578,435 5,424,644
Gross profit 923,665 1,168,794 986,933
Selling, general and administrative expenses 592,863 705,477 485,069
Amortization of intangible assets 34,848 34,257 25,865
Asset impairment charges 58,451    
Operating income 237,503 429,060 475,999
Interest expense (8,024) (4,765) (2,668)
Interest income 1,493 3,736 3,378
Equity in earnings (losses) of unconsolidated affiliates, including gain on sale of investment (466) (332) 112,744
Other income (expense), net (1,831) (1,100) (1,133)
Income from continuing operations before income taxes 228,675 426,599 588,320
Provision for income taxes 97,472 139,007 196,875
Net income from continuing operations 131,203 287,592 391,445
Net income from discontinued operations 190,621 27,490 29,864
Net income 321,824 315,082 421,309
Less: Net income attributable to non-controlling interests 10,917 18,368 19,388
Net income attributable to common stock 310,907 296,714 401,921
Amounts attributable to common stock:      
Net income from continuing operations 120,286 269,224 372,057
Net income from discontinued operations 190,621 27,490 29,864
Net income attributable to common stock $ 310,907 $ 296,714 $ 401,921
Earnings per share attributable to common stock- basic and diluted:      
Continuing operations $ 0.62 $ 1.22 $ 1.73
Discontinued operations 0.97 0.13 0.14
Net income attributable to common stock $ 1.59 $ 1.35 $ 1.87
Shares used in computing earnings per share:      
Weighted average basic shares outstanding 195,113 219,668 214,929
Weighted average diluted shares outstanding 195,120 219,690 214,978