Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 214,391	$ 89,077
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment and amortization of other intangible assets	39,652	41,455
Stock-based compensation	26,391	36,107
Excess tax benefit associated with stock-based compensation	(20,765)	(1,851)
Other, net	15,650	6,804
Changes in operating assets and liabilities
Accounts receivable	3,602	(38)
Prepaid expenses and other assets	17,087	(12,434)
Accounts payable and accrued liabilities	(9,211)	(7,338)
Deferred revenues	80,074	59,905
Net cash provided by operating activities	366,871	211,687
Cash flows from investing activities:
Proceeds from maturities and sales of marketable securities	393,677	543,503
Purchases of marketable securities	(1,579,234)	(75,705)
Purchases of property and equipment	(39,868)	(63,444)
Other investing activities	(638)	(1,179)
Net cash (used in) provided by investing activities	(1,226,063)	403,175
Cash flows from financing activities:
Proceeds from issuance of common stock from option exercises and employee stock purchase plans	26,573	41,510
Repurchases of common stock	(231,391)	(548,803)
Payments of Dividends	0	(463,498)
Excess tax benefit associated with stock-based compensation	20,765	1,851
Other financing activities	189	(1,117)
Net cash used in financing activities	(183,864)	(970,057)
Effect of exchange rate changes on cash and cash equivalents	162	(1,645)
Net decrease in cash and cash equivalents	(1,042,894)	(356,840)
Cash and cash equivalents at beginning of period	1,313,349	1,559,628
Cash and cash equivalents at end of period	270,455	1,202,788
Supplemental cash flow disclosures:
Cash paid for interest, net of capitalized interest	40,829	140,047
Cash paid for income taxes, net of refunds received	$ 19,975	$ 5,299