Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Gross Revenue	$ 244,055	$ 237,864	$ 719,544	$ 705,154
Direct Costs	154,024	148,267	448,370	436,316
Operating costs and expenses:
Indirect and selling expenses	67,647	66,356	203,513	199,613
Depreciation and amortization	2,771	2,766	8,352	7,058
Amortization of intangible assets	2,459	3,480	7,211	10,530
Total operating costs and expenses	72,877	72,602	219,076	217,201
Operating income	17,154	16,995	52,098	51,637
Interest expense	(476)	(924)	(1,870)	(3,165)
Other income (expense)	140	(116)	209	(379)
Income before income taxes	16,818	15,955	50,437	48,093
Provision for income taxes	5,687	6,382	18,863	19,237
Net income	11,131	9,573	31,574	28,856
Earnings per Share:
Basic (in Dollars per share)	$ 0.56	$ 0.49	$ 1.60	$ 1.46
Diluted (in Dollars per share)	$ 0.55	$ 0.48	$ 1.57	$ 1.44
Weighted-average Shares:
Basic (in Shares)	19,802	19,610	19,685	19,717
Diluted (in Shares)	20,165	19,770	20,088	20,004
Other comprehensive income:
Foreign currency translation adjustments	445	84	3	(535)
Comprehensive income	$ 11,576	$ 9,657	$ 31,577	$ 28,321