Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 30,988	$ 24,220
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	18,924	16,578
Amortization	31,599	12,963
Amortization of original issue discount	4,027	5,447
Gain on short-term investments and other	(46)	(112)
Loss on repurchase of convertible debt securities		12,635
Deferred income taxes	1,637	(160)
Excess tax benefit of stock-based compensation awards	(824)	(1,138)
Stock-based employee compensation	9,684	9,300
Changes in operating assets and liabilities:
Trade accounts and other receivables, net	(9,019)	(5,470)
Other current and non-current assets	574	(3,966)
Income taxes payable/receivable	(949)	(6,987)
Trade accounts payable and accrued liabilities	(31,096)	10,810
Deferred revenue	(26,365)	115
Net cash provided by operating activities	29,134	74,235
Cash flows from investing activities:
Purchases of property and equipment	(19,615)	(9,858)
Purchases of short-term investments	(31,903)	(61,888)
Proceeds from sale/maturity of short-term investments	35,200	81,900
Purchase of foreign currency hedge		(5,673)
Acquisition of businesses, net of cash acquired		(3,264)
Acquisition of and investments in client contracts	(6,713)	(3,610)
Change in restricted cash for Intec Acquisition		(130,000)
Net cash used in investing activities	(23,031)	(132,393)
Cash flows from financing activities:
Proceeds from issuance of common stock	1,158	1,046
Repurchase of common stock	(11,881)	(33,942)
Payments on acquired equipment financing	(1,357)	(837)
Proceeds from long-term debt		150,000
Payments of deferred financing costs	(205)	(6,541)
Payments on long-term debt	(67,649)	(148,846)
Excess tax benefit of stock-based compensation awards	824	1,138
Net cash used in financing activities	(79,110)	(37,982)
Effect of exchange rate fluctuations on cash	(691)
Net decrease in cash and cash equivalents	(73,698)	(96,140)
Cash and cash equivalents, beginning of period	197,858	163,489
Cash and cash equivalents, end of period	124,160	67,349
Supplemental disclosures of cash flow information:
Interest	11,739	3,781
Income taxes	$ 22,542	$ 14,331