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	$ 136,481	$ 30,161
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment and amortization of other intangible assets	26,273	27,642
Stock-based compensation	16,584	29,014
Excess tax benefit associated with stock-based compensation	(11,638)	(854)
Other, net	10,947	1,627
Changes in operating assets and liabilities
Accounts receivable	2,213	354
Deferred tax assets and other assets	5,855	(12,786)
Accounts payable and accrued liabilities	(16,644)	(22,736)
Deferred revenues	75,178	50,814
Net cash provided by operating activities	245,249	103,236
Cash flows from investing activities:
Proceeds from maturities and sales of marketable securities	8,101	369,586
Purchases of marketable securities	(1,097,669)	(44,038)
Purchases of property and equipment	(26,242)	(29,481)
Other investing activities	(520)	(1,181)
Net cash used in investing activities	(1,116,330)	294,886
Cash flows from financing activities:
Proceeds from issuance of common stock from option exercises and employee stock purchase plans	15,348	32,445
Repurchases of common stock	(152,725)	(310,671)
Payments of Dividends	0	(463,498)
Excess tax benefit associated with stock-based compensation	11,638	854
Other financing activities	189	0
Net cash used in financing activities	(125,550)	(740,870)
Effect of exchange rate changes on cash and cash equivalents	(1,097)	3,285
Net increase (decrease) in cash and cash equivalents	(997,728)	(339,463)
Cash and cash equivalents at beginning of period	1,313,349	1,559,628
Cash and cash equivalents at end of period	315,621	1,220,165
Supplemental cash flow disclosures:
Cash paid for interest, net of capitalized interest	20,476	120,082
Income Taxes Paid, Net	$ 21,193	$ 4,737

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).