CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income	$ 45,852	$ 27,195	$ 19,626
Adjustments to reconcile net income to net cash flows from operating activities
Depreciation	7,541	6,651	6,338
Amortization	20,836	19,696	17,389
Deferred income taxes	7,513	11,644	(4,363)
Stock-based compensation expense	11,254	7,790	7,645
Excess tax benefit of stock options exercised	(1,879)	(140)	114
Other	752	909	943
Changes in operating assets and liabilities, net of impact of acquisitions:
Billed and accrued receivables, net	(21,348)	14,330	(10,365)
Other current assets	4,076	(818)	68
Other noncurrent assets	(3,166)	(2,259)	1,387
Accounts payable	(4,963)	(2,318)	(1,680)
Accrued employee compensation	1,733	1,483	3,492
Accrued liabilities	803	(7,766)	(8,412)
Current income taxes	6,301	(4,224)	6,029
Deferred revenue	14,809	14,715	8,412
Other current and noncurrent liabilities	(6,652)	(5,580)	(2,406)
Net cash flows from operating activities	83,462	81,308	44,217
Cash flows from investing activities:
Purchases of property and equipment	(10,668)	(4,957)	(2,942)
Purchases of software and distribution rights	(8,309)	(8,209)	(7,529)
Alliance technical enablement expenditures	(1,856)	(6,183)	(6,899)
Purchase of available-for-sale securities	(10,000)
Acquisition of businesses, net of cash acquired	(16,850)		(7,047)
Proceeds from transfer of assets under contractual arrangements			1,050
Net cash flows from investing activities	(47,683)	(19,349)	(23,367)
Cash flows from financing activities:
Proceeds from issuance of common stock	1,273	1,132	1,243
Proceeds from exercises of stock options	4,478	3,147	1,811
Excess tax benefit of stock options exercised	1,879	140	88
Repurchases of common stock		(18,624)	(15,000)
Repurchase of restricted stock for tax withholdings	(742)	(562)	(622)
Repayment of revolving credit facility	(75,000)
Proceeds from interim revolving credit facility	75,000
Repayment of interim revolving credit facility	(75,000)
Proceeds from credit agreement	75,000
Payments on debt and capital leases	(3,820)	(1,576)	(1,576)
Distribution to noncontrolling interest		(1,232)
Payment for debt issuance costs	(11,789)
Net cash flows from financing activities	(8,721)	(17,575)	(14,056)
Effect of exchange rate fluctuations on cash	(1,270)	1,009	6,157
Net increase in cash and cash equivalents	25,788	45,393	12,951
Cash and cash equivalents, beginning of period	171,310	125,917	112,966
Cash and cash equivalents, end of period	197,098	171,310	125,917
Supplemental cash flow information
Income taxes paid, net	19,014	24,928	15,202
Interest paid	$ 1,783	$ 1,663	$ 3,564