Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues	$ 407,178	$ 395,228
Operating expenses
Direct cost of revenues	258,480	245,618
Selling, general and administrative expense	96,647	102,589
Special charges	427
Acquisition-related contingent consideration	731	557
Amortization of other intangible assets	5,564	5,517
Costs and Expenses, Total	361,849	354,281
Operating income	45,329	40,947
Other income (expense)
Interest income and other	937	3,282
Interest expense	(12,715)	(15,204)
Other (expense) income	(11,778)	(11,922)
Income before income tax provision	33,551	29,025
Income tax provision	9,871	10,594
Net income	23,680	18,431
Earnings per common share-basic	$ 0.60	$ 0.46
Earnings per common share-diluted	$ 0.58	$ 0.43
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax $0	(15,509)	12,849
Other comprehensive income (loss), net of tax	(15,509)	12,849
Comprehensive income	$ 8,171	$ 31,280