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Condensed Consolidated Statements of Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenues $ 425,552 $ 407,178
Operating expenses    
Direct cost of revenues 274,275 258,480
Selling, general and administrative expense 108,387 96,647
Special charges   427
Acquisition-related contingent consideration (1,843) 731
Amortization of other intangible assets 4,616 5,564
Costs and Expenses, Total 385,435 361,849
Operating income 40,117 45,329
Other income (expense)    
Interest income and other 1,003 937
Interest expense (12,655) (12,715)
Other (expense) income (11,652) (11,778)
Income before income tax provision 28,465 33,551
Income tax provision 10,348 9,871
Net income 18,117 23,680
Earnings per common share-basic $ 0.46 $ 0.60
Earnings per common share-diluted $ 0.45 $ 0.58
Other comprehensive income (loss), net of tax:    
Foreign currency translation adjustments, net of tax $0 4,728 (15,509)
Total other comprehensive income (loss), net of tax 4,728 (15,509)
Comprehensive income $ 22,845 $ 8,171