CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income (loss)	$ (28,904)	$ 9,088
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	31,381	25,798
Compensation expense associated with stock-based payments	11,274	12,906
Impairment losses on intangible assets	3,560
Unrealized foreign currency gains, net	(1,451)	(2,666)
Deferred income taxes	271	(296)
Excess tax benefit related to stock-based compensation	(1,402)	(1,869)
Other non-cash adjustments, net	1,329	924
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	54,435	52,704
Prepaid expenses and other current assets	(1,437)	1,600
Other assets	(567)	2,307
Accounts payable	325	3,305
Accrued compensation	(177)	(5,892)
Other accrued expenses	5,373	1,836
Income taxes payable	(14,459)	20,188
Deferred revenue	(23,552)	(2,944)
Other liabilities	(2,962)	(3,139)
Net cash provided by operating activities	33,037	113,850
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(10,730)	(89,429)
Purchases of property and equipment	(16,606)	(17,314)
Change in restricted cash	1,077	(7,903)
Purchases of cost method investments	(6,323)	(27,234)
Purchases of investment securities	(11,007)	(5,136)
Sales and maturities of investment securities	19,648	63,562
Contributions on equity method investment	(5,426)
Cash paid for intellectual property		(1,500)
Change in notes receivable		(750)
Net cash used in investing activities	(29,367)	(85,704)
Cash flows from financing activities:
Proceeds from loans payable	1,565
Repayment of loans payable	(21,293)	(238)
Repurchase of common stock		(205,745)
Repayment of capital lease obligations	(248)	(69)
Cash paid for line of credit fees		(500)
Proceeds from the exercise of stock options	22,977	24,925
Excess tax benefit related to stock-based compensation	1,402	1,869
Net cash provided by (used in) financing activities	4,403	(179,758)
Effect of exchange rate changes on cash and cash equivalents	(2,882)	(827)
Net increase (decrease) in cash and cash equivalents	5,191	(152,439)
Cash and cash equivalents, beginning of period	192,165	356,533
Cash and cash equivalents, end of period	197,356	204,094
Supplemental disclosures of consolidated cash flow information:
Cash paid for interest	2,722	1,570
Cash paid (received) for income taxes	$ 17,029	$ (14,261)