Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Gross Revenue	$ 264,796	$ 244,055	$ 773,708	$ 719,544
Direct Costs	166,064	154,024	486,461	448,370
Operating costs and expenses:
Indirect and selling expenses	74,704	67,647	218,573	203,513
Depreciation and amortization	3,227	2,771	9,493	8,352
Amortization of intangible assets	2,273	2,459	6,429	7,211
Total operating costs and expenses	80,204	72,877	234,495	219,076
Operating income	18,528	17,154	52,752	52,098
Interest expense	(800)	(476)	(2,288)	(1,870)
Other (expense) income	(335)	140	(991)	209
Income before income taxes	17,393	16,818	49,473	50,437
Provision for income taxes	5,840	5,687	18,206	18,863
Net income	11,553	11,131	31,267	31,574
Earnings per Share:
Basic (in Dollars per share)	$ 0.59	$ 0.56	$ 1.59	$ 1.60
Diluted (in Dollars per share)	$ 0.59	$ 0.55	$ 1.56	$ 1.57
Weighted-average Shares:
Basic (in Shares)	19,450	19,802	19,682	19,685
Diluted (in Shares)	19,713	20,165	20,069	20,088
Other comprehensive income (loss):
Foreign currency translation adjustments	(1,355)	445	(895)	3
Comprehensive income	$ 10,198	$ 11,576	$ 30,372	$ 31,577