UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
OPERATING ACTIVITIES:
Net income	$ 181,816	$ 104,013
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,685	4,166
Amortization	8,157	8,313
Provision for uncollectible accounts, net	3,998	2,812
Deferred income taxes	4,804	8,260
Stock-based compensation expense and other stock-based payments	16,640	14,110
Amortization of debt issuance costs	895	553
Amortization of debt discount	7,241	5,239
Changes in assets and liabilities:
Accounts receivable	(58,235)	(56,487)
Prepaid expenses and other current assets	(145,345)	3,307
Accounts payable, accrued expenses and other current liabilities	153,239	177,763
Other	1,485	4,170
Net cash provided by operating activities	182,380	276,219
INVESTING ACTIVITIES:
Purchase of investments	(1,301,457)	(472,872)
Proceeds from sale of investments	925,356	618,427
Additions to property and equipment	(13,697)	(8,279)
Acquisitions and other equity investments, net of cash acquired	(13,286)	(66,204)
Proceeds from settlement of foreign currency contracts	32,183	0
Payments on foreign currency contracts	0	(16,005)
Change in restricted cash	(600)	(16)
Net cash (used in) provided by investing activities	(371,501)	55,051
FINANCING ACTIVITIES:
Proceeds from the issuance of convertible debt	1,000,000	0
Payment of debt issuance costs	(20,327)	0
Repurchase of common stock	(254,225)	(157,262)
Proceeds from exercise of stock options	1,045	544
Excess tax benefit from stock-based compensation	4,040	9,520
Net cash provided by (used in) financing activities	730,533	(147,198)
Effect of exchange rate changes on cash and cash equivalents	17,827	8,035
Net increase in cash and cash equivalents	559,239	192,107
Cash and cash equivalents, beginning of period	632,836	358,967
Cash and cash equivalents, end of period	1,192,075	551,074
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid during the period for income taxes	173,528	28,956
Cash paid during the period for interest	3,912	3,601
Non-cash fair value increase for redeemable noncontrolling interests	$ 52,214	$ 10,355