UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
OPERATING ACTIVITIES:
Net income	$ 2,896,223	$ 1,461,079
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	135,736	101,953
Amortization	129,476	127,375
Provision for uncollectible accounts, net	42,575	32,401
Deferred income tax benefit	(25,655)	(71,972)
Stock-based compensation expense and other stock-based payments	192,548	175,131
Amortization of debt issuance costs	6,827	5,747
Amortization of debt discount	52,909	51,512
Loss on early extinguishment of debt	1,093	0
Impairment of goodwill	0	940,700
Impairment of cost-method investments	0	63,208
Excess tax benefits on stock-based awards and other equity deductions	0	72,116
Changes in assets and liabilities:
Accounts receivable	(479,184)	(470,295)
Prepaid expenses and other current assets	(136,304)	(104,097)
Accounts payable, accrued expenses and other current liabilities	640,960	523,279
Other	31,221	(20,968)
Net cash provided by operating activities	3,488,425	2,887,169
INVESTING ACTIVITIES:
Purchase of investments	(5,338,444)	(4,820,737)
Proceeds from sale of investments	2,471,883	2,835,570
Additions to property and equipment	(223,692)	(168,076)
Acquisitions and other investments, net of cash acquired	(552,805)	(811)
Acquisition of land use rights	0	(48,494)
Net cash used in investing activities	(3,643,058)	(2,202,548)
FINANCING ACTIVITIES:
Proceeds from the issuance of long-term debt	2,044,952	994,705
Payments related to conversion of senior notes	(89,575)	0
Payment of debt	(15,118)	0
Payments for repurchase of common stock	(1,123,102)	(754,342)
Proceeds from exercise of stock options	4,303	13,262
Net cash provided by financing activities	821,460	253,625
Effect of exchange rate changes on cash, cash equivalents and restricted cash	99,037	6,809
Net increase in cash, cash equivalents and restricted cash	765,864	945,055
Cash, cash equivalents and restricted cash, beginning of period	2,082,007	1,478,071
Cash, cash equivalents and restricted cash, end of period	2,847,871	2,423,126
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid during the period for income taxes	601,248	612,612
Cash paid during the period for interest	110,745	87,427
Non-cash financing activity	$ 1,000	$ 0