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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

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