Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Earnings [Abstract]
Gross Revenue	$ 840,775	$ 764,734	$ 674,399
Direct Costs	520,522	476,187	411,334
Operating costs and expenses
Indirect and selling expenses	241,062	218,533	203,428
Depreciation and amortization	10,757	10,775	9,416
Amortization of intangible assets	9,550	12,326	11,137
Total operating costs and expenses	261,369	241,634	223,981
Operating Income	58,884	46,913	39,084
Other (Expense) Income
Interest expense	(2,248)	(3,403)	(5,107)
Other	124	172	1,005
Income Before Income Taxes	56,760	43,682	34,982
Provision for Income Taxes	21,895	16,511	12,626
Net Income	$ 34,865	$ 27,171	$ 22,356
Earnings per Share:
Basic	$ 1.77	$ 1.40	$ 1.45
Diluted	$ 1.75	$ 1.38	$ 1.40
Weighted-average Common Shares Outstanding:
Basic	19,684	19,375	15,433
Diluted	19,928	19,626	15,914