CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
OPERATING ACTIVITIES:
Net income	$ 360,291	$ 168,471
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	9,225	7,869
Amortization	16,905	13,597
Provision for uncollectible accounts, net	4,852	3,464
Deferred income taxes	19,870	24,043
Stock-based compensation expense and other stock-based payments	27,341	27,374
Amortization of debt issuance costs	1,113	1,893
Amortization of debt discount	10,553	9,466
Loss on early extinguishment of debt	32	8,108
Changes in assets and liabilities:
Accounts receivable	(154,216)	(85,516)
Prepaid expenses and other current assets	9,089	(9,636)
Accounts payable, accrued expenses and other current liabilities	204,307	123,843
Other	(9,860)	(960)
Net cash provided by operating activities	499,502	292,016
INVESTING ACTIVITIES:
Purchase of investments	(1,006,694)	(796,728)
Proceeds from sale of investments	1,025,514	470,198
Additions to property and equipment	(18,077)	(10,233)
Acquisitions and other equity investments, net of cash acquired	(67,074)	(110,972)
Proceeds from settlement of foreign currency contracts		32,478
Payments on foreign currency contracts	(33,764)	(4,283)
Change in restricted cash	(35)	(33)
Net cash used in investing activities	(100,130)	(419,573)
FINANCING ACTIVITIES:
Proceeds from the issuance of convertible debt		575,000
Payment of debt issuance costs		(13,334)
Payments related to conversion of convertible debt	(213)	(173,375)
Repurchase of common stock	(158,691)	(125,423)
Payments to purchase subsidiary shares from noncontrolling interests	(12,986)
Proceeds from the sale of subsidiary shares to noncontrolling interests		4,311
Proceeds from exercise of stock options	3,870	23,449
Excess tax benefit on stock-based compensation	12,173	2,335
Net cash (used in) provided by financing activities	(155,847)	292,963
Effect of exchange rate changes on cash and cash equivalents	8,757	(11,512)
Net increase in cash and cash equivalents	252,282	153,894
Cash and cash equivalents, beginning of period	358,967	202,141
Cash and cash equivalents, end of period	611,249	356,035
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid during the period for income taxes	55,461	31,002
Cash paid during the period for interest	3,717	776
Non-cash fair value adjustment for redeemable noncontrolling interests	$ 33,740

The component of interest expense comprised of the periodic charge against earnings over the life of the financing arrangement to which such costs relate and, write-off of unamortized discount related to early debt conversions.

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The cash outflow from the repayment of the aggregate principal amount of convertible debt which is converted prior to maturity because it is redeemable at the option of the bond holder. If elected by the entity, it also includes cash paid for the conversion value in excess of the principal amount.

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The cash inflow for a financial contract that meets the hedge criteria as either a cash flow hedge, fair value hedge, or hedge of a net investment in a foreign operation. (2011 Draft Taxonomy)

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Change in redeemable noncontrolling interest during the period as a result of a change in the fair value of redeemable noncontrolling interest.

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The aggregate amount of noncash, equity-based employee remuneration and other stock-based expense. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The component of interest income or expense representing the periodic increase in or charge against earnings to reflect amortization of debt discounts and premiums over the life of the related debt instruments, which are liabilities of the entity.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method.

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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 should not be reported as cash and cash equivalents.

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The net change between the beginning and ending balance of cash and cash equivalents.

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The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

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The effect of exchange rate changes on cash balances held in foreign currencies.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from share-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The net change during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The net change during the reporting period in the aggregate amount of liabilities that result from activities that generate operating income.

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For entities with classified balance sheets, the net change during the reporting period in the value of other assets or liabilities used in operating activities, that are not otherwise defined in the taxonomy. For entities with unclassified balance sheets, the net change during the reporting period in the value of all other assets or liabilities used in operating activities.

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The net change during the reporting period in the value of this group of assets within the working capital section.

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The net cash inflow (outflow) for the net change associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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The amount of cash paid during the current period for interest owed on money borrowed, net of interest capitalized.

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The net cash inflow (outflow) from financing activity for the period.

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The net cash inflow (outflow) from investing activity.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income.

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The cash outflow to reacquire common stock during the period.

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The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow (outflow) from noncontrolled interest to increase or decrease the number of shares they have in the entity. This does not include dividends paid to the noncontrolling interest.

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the amount received from holders exercising their stock options.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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