Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Consolidated net income	$ 16,270	$ 129,660
Adjustments to reconcile consolidated net income to net cash from operating activities:
Depreciation and amortization	43,396	40,758
Non-cash portion of share-based compensation	65,007	47,586
Deferred income taxes	(13,904)	1,503
Loss on equity investments	14,000	0
Excess tax benefits from share-based compensation	(4,319)	(39,041)
Amortization of debt issuance costs	236	0
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	126,462	125,610
Prepaid expenses and other assets	(22,272)	(59,372)
Accounts payable	(126,846)	(58,468)
Accrued compensation	(15,426)	(66,510)
Income tax payable	(3,750)	38,099
Other accrued liabilities	(9,146)	13,981
Deferred revenue	32,558	65,844
Net cash provided by operating activities	102,266	239,650
Cash flows from investing activities:
Purchases of property and equipment	(81,991)	(53,972)
Purchases of trading investments	(2,659)	(2,495)
Purchases of available-for-sale investments	(371,285)	(437,773)
Proceeds from sales of available-for-sale investments	231,366	193,301
Proceeds from maturities of available-for-sale investments	222,840	126,260
Payment for business acquisition, net of cash and cash equivalents acquired	(90,487)	(28,573)
Changes in restricted cash	35	0
Purchases of privately-held and other equity investments, net	(1,122)	(5,972)
Net cash used in investing activities	(93,303)	(209,224)
Cash flows from financing activities:
Proceeds from issuance of common stock	37,798	264,113
Purchases and retirement of common stock	(56,088)	(205,171)
Issuance of long-term debt, net	0	991,556
Change in customer financing arrangements	7,683	12,531
Excess tax benefit from share-based compensation	4,319	39,041
Net cash provided by (used in) financing activities	(6,288)	1,102,070
Net increase in cash and cash equivalents	2,675	1,132,496
Cash and cash equivalents at beginning of period	2,910,420	1,811,887
Cash and cash equivalents at end of period	$ 2,913,095	$ 2,944,383