Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues	$ 1,132,232	$ 1,050,134	$ 949,303
Direct Costs	694,436	654,946	591,516
Operating costs and expenses
Indirect and selling expenses	329,159	302,020	272,387
Depreciation and amortization	16,222	13,369	11,238
Amortization of intangible assets	17,184	10,437	9,477
Total operating costs and expenses	362,565	325,826	293,102
Operating Income	75,231	69,362	64,685
Interest expense	(10,072)	(4,254)	(2,447)
Other expense	(1,559)	(958)	(12)
Income Before Income Taxes	63,600	64,150	62,226
Provision for Income Taxes	24,231	24,120	22,896
Net Income	$ 39,369	$ 40,030	$ 39,330
Earnings per Share:
Basic (in dollars per share)	$ 2.04	$ 2.04	$ 1.99
Diluted (in dollars per share)	$ 2	$ 2	$ 1.95
Weighted-average Common Shares Outstanding:
Basic (in shares)	19,335	19,608	19,755
Diluted (in shares)	19,663	19,997	20,186
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	$ (5,010)	$ (1,491)	$ 251
Comprehensive income, net of tax	$ 34,359	$ 38,539	$ 39,581