UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES:
Net income	$ 850,359	$ 907,669
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	46,695	32,889
Amortization	85,981	45,774
Provision for uncollectible accounts, net	13,233	8,122
Deferred income taxes	(41,577)	26,070
Stock-based compensation expense and other stock-based payments	115,269	75,151
Amortization of debt issuance costs	4,218	2,585
Amortization of debt discount	33,211	24,259
Loss on early extinguishment of debt	3	6,129
Changes in assets and liabilities:
Accounts receivable	(287,940)	(312,959)
Prepaid expenses and other current assets	(300,482)	(263,963)
Accounts payable, accrued expenses and other current liabilities	405,818	312,925
Other	(13,429)	2,334
Net cash provided by operating activities	911,359	866,985
INVESTING ACTIVITIES:
Purchase of investments	(4,686,507)	(4,305,033)
Proceeds from sale of investments	2,231,926	6,078,411
Additions to property and equipment	(84,351)	(61,986)
Acquisitions and other investments, net of cash acquired	(45,937)	(101,050)
Proceeds from foreign currency contracts	453,818	9,029
Payments on foreign currency contracts	(448,640)	(78,866)
Change in restricted cash	(225)	(5,194)
Net cash (used in) provided by investing activities	(2,579,916)	1,535,311
FINANCING ACTIVITIES:
Proceeds from the issuance of long-term debt	1,619,951	0
Payment of debt issuance costs	(13,272)	0
Payments related to conversion of senior notes	(147,629)	(117,830)
Repurchase of common stock	(986,581)	(97,326)
Proceeds from exercise of stock options	12,825	9,686
Excess tax benefits on stock-based compensation	68,241	12,222
Net cash provided by (used in) financing activities	553,535	(193,248)
Effect of exchange rate changes on cash and cash equivalents	(144,680)	4,857
Net (decrease) increase in cash and cash equivalents	(1,259,702)	2,213,905
Cash and cash equivalents, beginning of period	3,148,651	1,289,994
Cash and cash equivalents, end of period	1,888,949	3,503,899
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid during the period for income taxes	472,350	385,506
Cash paid during the period for interest	13,537	8,080
Non-cash investing activity for contingent consideration	9,170	24,377
Non-cash financing activity for acquisitions	$ 0	$ 5,584