Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Gross Revenue	$ 263,860	$ 241,568	$ 508,912	$ 475,489
Direct Costs	166,667	151,528	320,397	294,346
Operating costs and expenses:
Indirect and selling expenses	74,232	67,604	143,869	135,866
Depreciation and amortization	3,190	2,782	6,266	5,581
Amortization of intangible assets	2,197	2,359	4,156	4,752
Total operating costs and expenses	79,619	72,745	154,291	146,199
Operating income	17,574	17,295	34,224	34,944
Interest expense	(774)	(626)	(1,488)	(1,394)
Other (expense) income	(621)	(9)	(656)	69
Income before income taxes	16,179	16,660	32,080	33,619
Provision for income taxes	6,181	6,329	12,366	13,176
Net income	9,998	10,331	19,714	20,443
Earnings per Share:
Basic (in Dollars per share)	$ 0.51	$ 0.52	$ 1.00	$ 1.04
Diluted (in Dollars per share)	$ 0.50	$ 0.52	$ 0.98	$ 1.02
Weighted-average Shares:
Basic (in Shares)	19,795	19,706	19,799	19,625
Diluted (in Shares)	20,082	19,996	20,213	19,993
Other comprehensive income (loss):
Foreign currency translation adjustments	807	(197)	460	(442)
Comprehensive income	$ 10,805	$ 10,134	$ 20,174	$ 20,001