Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Gross Revenue	$ 241,568	$ 239,649	$ 475,489	$ 467,290
Direct Costs	151,528	147,861	294,346	288,049
Operating costs and expenses:
Indirect and selling expenses	67,604	67,404	135,866	133,257
Depreciation and amortization	2,782	2,597	5,581	4,292
Amortization of intangible assets	2,359	3,519	4,752	7,050
Total operating costs and expenses	72,745	73,520	146,199	144,599
Operating income	17,295	18,268	34,944	34,642
Interest expense	(626)	(814)	(1,394)	(2,241)
Other income (expense)	(9)	(212)	69	(263)
Income before income taxes	16,660	17,242	33,619	32,138
Provision for income taxes	6,329	6,896	13,176	12,855
Net income	10,331	10,346	20,443	19,283
Earnings per Share:
Basic (in Dollars per share)	$ 0.52	$ 0.52	$ 1.04	$ 0.98
Diluted (in Dollars per share)	$ 0.52	$ 0.52	$ 1.02	$ 0.96
Weighted-average Shares:
Basic (in Shares)	19,706	19,774	19,625	19,771
Diluted (in Shares)	19,996	19,971	19,993	20,061
Other comprehensive income:
Foreign currency translation adjustments	(197)	(230)	(442)	(619)
Comprehensive income	$ 10,134	$ 10,116	$ 20,001	$ 18,664