Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gross Revenue	$ 1,050,134	$ 949,303	$ 937,133
Direct Costs	654,946	591,516	583,195
Operating costs and expenses
Indirect and selling expenses	302,020	272,387	263,878
Depreciation and amortization	13,369	11,238	9,789
Amortization of intangible assets	10,437	9,477	14,089
Total operating costs and expenses	325,826	293,102	287,756
Operating Income	69,362	64,685	66,182
Interest expense	(4,254)	(2,447)	(3,946)
Other expense	(958)	(12)	(325)
Income Before Income Taxes	64,150	62,226	61,911
Provision for Income Taxes	24,120	22,896	23,836
Net Income	40,030	39,330	38,075
Earnings per Share:
Basic (in Dollars per share)	$ 2.04	$ 1.99	$ 1.94
Diluted (in Dollars per share)	$ 2.00	$ 1.95	$ 1.91
Weighted-average Common Shares Outstanding:
Basic (in Shares)	19,608,000	19,755,000	19,663,000
Diluted (in Shares)	19,997,000	20,186,000	19,957,000
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	(1,491)	251	(436)
Comprehensive income, net of tax	$ 38,539	$ 39,581	$ 37,639