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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement [Abstract]      
Revenues $ 1,631,997 $ 1,137,986 $ 515,584
Cost of services 1,143,591 782,093 337,896
Gross profit 488,406 355,893 177,688
Selling, general and administrative expenses 342,687 256,696 136,709
Amortization of intangible assets 21,751 18,016 2,346
Operating income 123,968 81,181 38,633
Interest expense, net (15,863) (15,768) (2,936)
Write-off of loan costs (14,958) (813) 0
Income before income taxes 93,147 64,600 35,697
Provision for income taxes 38,792 28,141 14,833
Income from continuing operations 54,355 36,459 20,864
Gain on sale of discontinued operations, net of income taxes 30,840 0 0
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent (683) 6,194 3,433
Net income 84,512 42,653 24,297
Basic earnings per common share:      
Income from continuing operations $ 1.02 $ 0.78 $ 0.57
Income from discontinued operations $ 0.56 $ 0.13 $ 0.09
Net income $ 1.58 $ 0.91 $ 0.66
Diluted earnings per common share:      
Income from continuing operations $ 1.00 $ 0.76 $ 0.55
Income from discontinued operations $ 0.55 $ 0.13 $ 0.09
Net income $ 1.55 $ 0.89 $ 0.64
Number of shares and share equivalents used to calculate earnings per share:      
Basic (in shares) 53,481 46,739 36,876
Diluted (in shares) 54,555 47,826 37,758
Reconciliation of net income to comprehensive income:      
Net income 84,512 42,653 24,297
Changes in fair value of derivative, net of income tax of $(113), $21 and $227, respectively 193 (21) (380)
Foreign currency translation adjustment 1,128 854 (1,662)
Comprehensive income $ 85,833 $ 43,486 $ 22,255