UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 2,622,086	$ 2,541,604
Short-term investments in marketable securities	4,240,704	4,859,873
Accounts receivable, net of allowance for doubtful accounts of $43,620 and $39,282, respectively	1,530,321	1,217,801
Prepaid expenses and other current assets	1,111,753	415,527
Total current assets	9,504,864	9,034,805
Property and equipment, net	573,040	480,081
Intangible assets, net	2,140,098	2,176,823
Goodwill	2,754,747	2,737,671
Long-term investments in marketable securities	9,432,763	10,421,600
Other assets	613,448	600,283
Total assets	25,018,960	25,451,263
Current liabilities:
Accounts payable	841,274	667,523
Accrued expenses and other current liabilities	1,238,815	1,138,980
Deferred merchant bookings	1,425,649	980,455
Convertible debt	941,657	710,910
Total current liabilities	4,447,395	3,497,868
Deferred income taxes	481,220	481,139
Long-term U.S. transition tax liability	1,250,846	1,250,846
Other long-term liabilities	161,340	148,061
Long-term debt	7,990,418	8,809,788
Total liabilities	14,331,219	14,187,702
Convertible debt	51,398	2,963
Stockholders' equity:
Common stock, $0.008 par value; authorized 1,000,000,000 shares, 62,838,223 and 62,689,097 shares issued, respectively	488	487
Treasury stock, 14,589,938 and 14,216,819 shares, respectively	(9,430,421)	(8,698,829)
Additional paid-in capital	5,034,164	5,783,089
Retained earnings	14,975,706	13,938,869
Accumulated other comprehensive income	56,406	236,982
Total stockholders' equity	10,636,343	11,260,598
Total liabilities and stockholders' equity	$ 25,018,960	$ 25,451,263