CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net income (loss)	$ (30,869)	$ (102,525)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation of property and equipment, including internal-use software and website development	292,600	221,278
Amortization of stock-based compensation	97,313	149,339
Amortization of intangible assets	132,955	174,180
Deferred income taxes	2,278	24,107
Foreign exchange (gain) loss on cash, cash equivalents and short-term investments, net	(57,888)	(23,916)
Realized (gain) loss on foreign currency forwards	(7,218)	19,081
Other	(9,398)	(8,415)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(434,412)	(367,188)
Prepaid expenses and other assets	(69,101)	(57,052)
Accounts payable, merchant	197,346	126,056
Accounts payable, other, accrued expenses and other current liabilities	278,800	154,368
Tax payable/receivable, net	(157,881)	(190,948)
Deferred merchant bookings	2,029,942	1,511,578
Deferred revenue	101,173	96,154
Net cash provided by operating activities	2,365,640	1,726,097
Investing activities:
Capital expenditures, including internal-use software and website development	(356,892)	(379,981)
Purchases of investments	(991,371)	(20,446)
Sales and maturities of investments	175,319	22,758
Net settlement of foreign currency forwards	7,218	(19,081)
Acquisitions, net of cash acquired	(138,215)	0
Other, net	0	2,222
Net cash used in investing activities	(1,303,941)	(394,528)
Financing activities:
Payment of HomeAway Convertible Notes	0	(400,443)
Purchases of treasury stock	(114,327)	(328,311)
Payment of dividends to stockholders	(84,685)	(71,947)
Proceeds from exercise of equity awards and employee stock purchase plan	136,979	69,777
Other, net	(18,605)	(17,565)
Net cash used in financing activities	(80,638)	(748,489)
Effect of exchange rate changes on cash and cash equivalents	96,951	37,145
Net increase in cash and cash equivalents	1,078,012	620,225
Cash and cash equivalents at beginning of period	1,796,811	1,676,299
Cash and cash equivalents at end of period	2,874,823	2,296,524
Supplemental cash flow information
Cash paid for interest	90,425	72,814
Income tax payments, net	$ 107,480	$ 89,972