UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 3,186,665	$ 2,541,604
Short-term investments in marketable securities	4,145,753	4,859,873
Accounts receivable, net of allowance for doubtful accounts of $47,258 and $39,282, respectively	1,715,055	1,217,801
Prepaid expenses and other current assets	985,901	415,527
Total current assets	10,033,374	9,034,805
Property and equipment, net	613,462	480,081
Intangible assets, net	2,162,766	2,176,823
Goodwill	2,850,396	2,737,671
Long-term Investments	9,444,908	10,872,527
Other assets	191,347	149,356
Total assets	25,296,253	25,451,263
Current liabilities:
Accounts payable	1,053,509	667,523
Accrued expenses and other current liabilities	1,418,603	1,138,980
Deferred merchant bookings	1,802,182	980,455
Convertible debt	948,190	710,910
Total current liabilities	5,222,484	3,497,868
Deferred income taxes	502,581	481,139
Long-term U.S. transition tax liability	1,144,682	1,250,846
Other long-term liabilities	143,651	148,061
Long-term debt	7,764,580	8,809,788
Total liabilities	14,777,978	14,187,702
Convertible debt	45,643	2,963
Stockholders' equity:
Common stock, $0.008 par value; authorized 1,000,000,000 shares, 62,926,877 and 62,689,097 shares issued, respectively	489	487
Treasury stock, 15,162,512 and 14,216,819 shares, respectively	(10,630,361)	(8,698,829)
Additional paid-in capital	5,225,709	5,783,089
Retained earnings	15,953,078	13,938,869
Accumulated other comprehensive income (loss)	(76,283)	236,982
Total stockholders' equity	10,472,632	11,260,598
Total liabilities and stockholders' equity	$ 25,296,253	$ 25,451,263