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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues $ 5,920,269 $ 4,193,764 $ 3,629,433
Cost of services (including depreciation) 4,982,562 3,632,048 3,039,912
Gross profit 937,707 561,716 589,521
Selling, general and administrative expenses 434,894 337,835 307,875
Amortization of intangible assets 37,691 29,039 37,655
Operating income 465,122 194,842 243,991
Interest expense (3,746) (1,803) (4,902)
Interest income 1,471 1,066 1,417
Loss on early extinguishment of debt, net     (7,107)
Equity in earnings of unconsolidated affiliates 2,084    
Other income (expense), net (351) (597) 559
Income from continuing operations before income taxes 464,580 193,508 233,958
Provision for income taxes 158,859 63,096 88,884
Net income from continuing operations 305,721 130,412 145,074
Income from discontinued operations, net of taxes 16,935 14,004 10,483
Net income 322,656 144,416 155,557
Less: Net income attributable to noncontrolling interests 16,027 11,901 2,381
Net income attributable to common stock 306,629 132,515 153,176
Amounts attributable to common stock:      
Net income from continuing operations 289,694 118,511 142,693
Net income from discontinued operations 16,935 14,004 10,483
Net income attributable to common stock $ 306,629 $ 132,515 $ 153,176
Earnings per share attributable to common stock - basic:      
Continuing operations $ 1.36 $ 0.56 $ 0.68
Discontinued operations $ 0.08 $ 0.06 $ 0.05
Net income attributable to common stock $ 1.44 $ 0.62 $ 0.73
Earnings per share attributable to common stock - diluted:      
Continuing operations $ 1.36 $ 0.56 $ 0.67
Discontinued operations $ 0.08 $ 0.06 $ 0.05
Net income attributable to common stock $ 1.44 $ 0.62 $ 0.72
Shares used in computing earnings per share:      
Weighted average basic shares outstanding 212,777 212,648 210,046
Weighted average diluted shares outstanding 212,835 213,168 211,796