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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Revenues $ 470,285 $ 432,338
Operating expenses    
Direct cost of revenues 305,636 279,030
Selling, general and administrative expenses 103,609 102,214
Special charges 5,061  
Acquisition-related contingent consideration 1,134 234
Amortization of other intangible assets 2,606 3,012
Costs and Expenses, Total 418,046 384,490
Operating income 52,239 47,848
Other income (expense)    
Interest income and other 2,557 (137)
Interest expense (6,229) (12,368)
Other (expense) income (3,672) (12,505)
Income before income tax provision 48,567 35,343
Income tax provision 18,386 11,657
Net income $ 30,181 $ 23,686
Earnings per common share — basic $ 0.75 $ 0.59
Earnings per common share — diluted $ 0.73 $ 0.57
Other comprehensive loss, net of tax    
Foreign currency translation adjustments, net of tax expense of $0 $ (358) $ (20,482)
Total other comprehensive loss, net of tax (358) (20,482)
Comprehensive income $ 29,823 $ 3,204