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CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues $ 1,460,150 $ 941,765 $ 467,010
Cost of revenues 1,274,947 818,976 391,435
Gross profit 185,203 122,789 75,575
Selling, general and administrative expenses 86,204 64,985 34,781
Merger related stock expense     390
Operating income 98,999 57,804 40,404
Other income (expense):      
Income from non-consolidated investments 4,018 4,630 8,753
Foreign exchange (loss) gain (96) 250 293
Other expense (1,088) (1,429)  
Interest income 331 616 640
Interest expense (5,431) (6,196) (1,979)
Income from continuing operations, before provision for income taxes 96,733 55,675 48,111
Provision for income taxes (38,174) (22,059) (18,350)
Income from continuing operations 58,559 33,616 29,761
Loss on discontinued operations, net of income taxes     (3,849)
Net income $ 58,559 $ 33,616 $ 25,912
Dividends per common share (in dollars per share) $ 0.11 $ 0.10 $ 0.10
Basic:      
Income from continuing operations (in dollars per share) $ 1.15 $ 0.79 $ 0.93
Loss on discontinued operations (in dollars per share)     $ (0.12)
Net income (in dollars per share) $ 1.15 $ 0.79 $ 0.81
Diluted:      
Income from continuing operations (in dollars per share) $ 1.14 $ 0.72 $ 0.86
Loss on discontinued operations (in dollars per share)     $ (0.11)
Net income (in dollars per share) $ 1.14 $ 0.72 $ 0.75
Weighted average common shares outstanding:      
Basic (in shares) 50,707 42,694 31,937
Diluted (in shares) 51,153 46,878 34,418