CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Revenue	$ 473,696	$ 363,826	$ 302,867
Cost of services:
Compensation	161,547	126,613	106,402
Data processing	31,491	23,118	17,997
Occupancy	17,456	15,053	13,323
Direct project costs	55,272	42,517	35,482
Other operating costs	20,593	18,054	16,515
Amortization of acquisition related software and intangibles	32,551	8,450	6,217
Total cost of services	318,910	233,805	195,936
Selling, general and administrative expenses	55,274	49,150	40,187
Total operating expenses	374,184	282,955	236,123
Operating income	99,512	80,871	66,744
Interest expense	(16,561)	(605)	(94)
Other income/(expense), net	382	632	(69)
Interest income	12	65	94
Income before income taxes	83,345	80,963	66,675
Income taxes	32,829	33,178	26,583
Net income and comprehensive income	$ 50,516	$ 47,785	$ 40,092
Basic income per common share:
Net income per share-basic (in dollars per share)	$ 0.59	$ 0.56	$ 0.49
Diluted income per share:
Net income per share-diluted (in dollars per share)	$ 0.57	$ 0.55	$ 0.47
Weighted average shares:
Basic (in shares)	86,204	84,588	81,762
Diluted (in shares)	88,365	87,444	85,375