UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 2,634,264	$ 2,081,075
Short-term investments	3,721,825	2,218,880
Accounts receivable, net of allowance for doubtful accounts of $31,291 and $25,565, respectively	1,230,602	860,115
Prepaid expenses and other current assets	685,879	241,449
Total current assets	8,272,570	5,401,519
Property and equipment, net	425,100	347,017
Intangible assets, net	1,914,767	1,993,885
Goodwill	2,418,630	2,396,906
Long-term investments	10,263,659	9,591,067
Other assets	163,597	108,579
Total assets	23,458,323	19,838,973
Current liabilities:
Accounts payable	598,200	419,108
Accrued expenses and other current liabilities	1,073,632	857,467
Deferred merchant bookings	1,185,639	614,361
Convertible debt	899,484	967,734
Total current liabilities	3,756,955	2,858,670
Deferred income taxes	397,449	822,334
Other long-term liabilities	134,537	138,767
Long-term debt	7,564,636	6,170,522
Total liabilities	11,853,577	9,990,293
Convertible debt	15,077	28,538
Stockholders' equity:
Common stock, $0.008 par value; authorized 1,000,000,000 shares, 62,560,183 and 62,379,247 shares issued, respectively	486	485
Treasury stock, 13,503,447 and 13,190,929 shares, respectively	(7,411,392)	(6,855,164)
Additional paid-in capital	5,633,659	5,482,653
Retained earnings	12,793,001	11,326,852
Accumulated other comprehensive income (loss)	573,915	(134,684)
Total stockholders' equity	11,589,669	9,820,142
Total liabilities and stockholders' equity	$ 23,458,323	$ 19,838,973