Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 544,450	$ 320,032	$ 142,891
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment and amortization of other intangible assets	60,655	54,819	55,706
Stock-based compensation	36,649	33,362	43,272
Excess tax benefit associated with stock-based compensation	(19,320)	(18,436)	(13,420)
Deferred Income Tax Expense	(112,688)	71,800	24,779
Unrealized Gain (Loss) on Derivatives	17,801	(422)	1,125
Gain on Sale of Investments	(18,861)	(102)	(4,246)
Other, net	(13,360)	(11,505)	(16,086)
Changes in operating assets and liabilities
Accounts receivable	(2,500)	3,327	(251)
Prepaid expenses and other assets	(2,694)	(9,344)	7,895
Accounts payable and accrued liabilities	19,291	(12,922)	(3,469)
Deferred revenues	43,254	84,011	65,533
Net cash provided by operating activities	579,397	537,630	335,901
Cash flows from investing activities:
Proceeds from maturities and sales of marketable securities	3,508,569	1,234,156	546,006
Purchases of marketable securities	(3,450,068)	(2,622,898)	(78,975)
Purchases of property and equipment	(65,594)	(53,023)	(192,660)
Other investing activities	(3,969)	(588)	(1,129)
Net cash (used in) provided by investing activities	(11,062)	(1,442,353)	273,242
Cash flows from financing activities:
Proceeds from issuance of common stock from option exercises and employee stock purchase plans	20,667	29,303	49,983
Repurchases of common stock	(1,035,617)	(325,680)	(550,097)
Payments of dividends to stockholders	0	0	(463,498)
Proceeds received from borrowing	738,297	0	0
Proceeds from Lines of Credit	0	0	100,000
Repayments of borrowings	(100,000)	0	(1,067)
Excess tax benefit associated with stock-based compensation	19,320	18,436	13,420
Other financing activities	0	189	(939)
Net cash used in financing activities	(357,333)	(277,752)	(852,198)
Effect of exchange rate changes on cash and cash equivalents	(2,515)	(138)	(3,224)
Net (decrease) increase in cash and cash equivalents	208,487	(1,182,613)	(246,279)
Cash and cash equivalents at beginning of period	130,736	1,313,349	1,559,628
Cash and cash equivalents at end of period	339,223	130,736	1,313,349
Supplemental cash flow disclosures:
Cash paid for interest, net of capitalized interest	58,928	41,276	140,193
Cash paid for income taxes, net of refunds received	$ 26,133	$ 19,436	$ 6,567