CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 2,541,604	$ 2,081,075
Short-term investments	4,859,873	2,218,880
Accounts receivable, net of allowance for doubtful accounts of $39,282 and $25,565, respectively	1,217,801	860,115
Prepaid expenses and other current assets	415,527	241,449
Total current assets	9,034,805	5,401,519
Property and equipment, net	480,081	347,017
Intangible assets, net	2,176,823	1,993,885
Goodwill	2,737,671	2,396,906
Long-term investments	10,421,600	9,591,067
Other assets	600,283	108,579
Total assets	25,451,263	19,838,973
Current liabilities:
Accounts payable	667,523	419,108
Accrued expenses and other current liabilities	1,138,980	857,467
Deferred merchant bookings	980,455	614,361
Convertible debt	710,910	967,734
Total current liabilities	3,497,868	2,858,670
Deferred income taxes	481,139	822,334
Long-term U.S. transition tax liability	1,250,846	0
Other long-term liabilities	148,061	138,767
Long-term debt	8,809,788	6,170,522
Total liabilities	14,187,702	9,990,293
Commitments and Contingencies (See Note 14)
Convertible debt	2,963	28,538
Stockholders' equity:
Common stock, $0.008 par value, authorized 1,000,000,000 shares, 62,689,097 and 62,379,247 shares issued, respectively	487	485
Treasury stock, 14,216,819 and 13,190,929 shares, respectively	(8,698,829)	(6,855,164)
Additional paid-in capital	5,783,089	5,482,653
Retained earnings	13,938,869	11,326,852
Accumulated other comprehensive income (loss)	236,982	(134,684)
Total stockholders' equity	11,260,598	9,820,142
Total liabilities and stockholders' equity	$ 25,451,263	$ 19,838,973