Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements of Comprehensive Income [Abstract]
Gross Revenue	$ 233,921	$ 227,641
Direct Costs	142,818	140,188
Operating costs and expenses:
Indirect and selling expenses	68,262	65,853
Depreciation and amortization	2,799	1,695
Amortization of intangible assets	2,393	3,531
Total operating costs and expenses	73,454	71,079
Operating income	17,649	16,374
Interest expense	(768)	(1,427)
Other income (expense)	78	(51)
Income before income taxes	16,959	14,896
Provision for income taxes	6,847	5,959
Net income	10,112	8,937
Earnings per Share:
Basic	$ 0.52	$ 0.45
Diluted	$ 0.51	$ 0.45
Weighted-average Shares:
Basic	19,543	19,769
Diluted	19,875	20,082
Other comprehensive income:
Foreign currency translation adjustments	(245)	(389)
Comprehensive income	$ 9,867	$ 8,548