Consolidated Statements of Income (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Income
Revenues before reimbursements	$ 173,293	$ 154,617	$ 342,897	$ 308,487
Reimbursements	21,115	17,706	40,310	37,386
Total revenues	194,408	172,323	383,207	345,873
Cost of services before reimbursable expenses	116,822	102,128	231,637	204,358
Reimbursable expenses	21,115	17,706	40,310	37,386
Total costs of services	137,937	119,834	271,947	241,744
General and administrative expenses	31,143	29,089	63,552	59,549
Depreciation expense	3,206	3,553	6,583	7,354
Amortization expense	2,163	2,962	4,464	5,758
Operating income	19,959	16,885	36,661	31,468
Interest expense	1,911	3,508	3,751	6,986
Interest income	(429)	(311)	(796)	(624)
Other expense (income), net	72	(44)	36	61
Income before income tax expense	18,405	13,732	33,670	25,045
Income tax expense	7,645	5,904	14,132	10,770
Net income	$ 10,760	$ 7,828	$ 19,538	$ 14,275
Basic net income per share	$ 0.21	$ 0.16	$ 0.39	$ 0.29
Shares used in computing income per basic share	50,820	49,205	50,498	48,948
Diluted net income per share	$ 0.21	$ 0.16	$ 0.38	$ 0.28
Shares used in computing income per diluted share	51,270	50,264	51,153	50,180