Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Gross Revenue	$ 949,303	$ 937,133	$ 840,775
Direct Costs	591,516	583,195	520,522
Operating costs and expenses
Indirect and selling expenses	272,387	263,878	240,964
Depreciation and amortization	11,238	9,789	10,258
Amortization of intangible assets	9,477	14,089	9,550
Total operating costs and expenses	293,102	287,756	260,772
Operating Income	64,685	66,182	59,481
Interest expense	(2,447)	(3,946)	(2,747)
Other (expense) income	(12)	(325)	26
Income Before Income Taxes	62,226	61,911	56,760
Provision for Income Taxes	22,896	23,836	21,895
Net Income	39,330	38,075	34,865
Earnings per Share:
Basic (in Dollars per share)	$ 1.99	$ 1.94	$ 1.77
Diluted (in Dollars per share)	$ 1.95	$ 1.91	$ 1.75
Weighted-average Common Shares Outstanding:
Basic (in Shares)	19,755	19,663	19,684
Diluted (in Shares)	20,186	19,957	19,928
Other comprehensive income:
Foreign currency translation adjustments	251	(436)	(281)
Comprehensive income	$ 39,581	$ 37,639	$ 34,584