CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities:
Net income (loss)	$ 66,050	$ (44,353)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of property and equipment, including internal-use software and website development	127,692	100,005
Amortization of stock-based compensation	45,835	91,164
Amortization of intangible assets	36,756	31,407
Deferred income taxes	(809)	25,012
Foreign exchange (gain) loss on cash, cash equivalents and short-term investments, net	(15,746)	84,299
Realized (gain) loss on foreign currency forwards	3,590	(24,189)
Other	(5,107)	10,871
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(307,000)	(207,418)
Prepaid expenses and other current assets	(44,926)	(56,372)
Accounts payable, merchant	168,202	301,568
Accounts payable, other, accrued expenses and other current liabilities	236,810	9,470
Taxes payable/receivable, net	(42,764)	(84,491)
Deferred merchant bookings	1,175,122	948,749
Deferred revenue	21,237	13,886
Net cash provided by operating activities	1,464,942	1,199,608
Investing activities:
Capital expenditures, including internal-use software and website development	(157,213)	(157,840)
Purchases of investments	(1,026,054)	(1,129,789)
Sales and maturities of investments	419,478	772,817
Acquisitions, net of cash acquired		(540,489)
Net settlement of foreign currency forwards	(3,590)	24,189
Other, net	2,386	(43)
Net cash used in investing activities	(764,993)	(1,031,155)
Financing activities:
Purchases of treasury stock	(339,020)	(134,238)
Proceeds from issuance of treasury stock		25,273
Payment of dividends to stockholders	(38,833)	(35,621)
Proceeds from exercise of equity awards and employee stock purchase plan	53,156	34,613
Excess tax benefit on equity awards	27,394	28,827
Other, net	1,693	(8,886)
Net cash provided by (used in) financing activities	(295,610)	(90,032)
Effect of exchange rate changes on cash and cash equivalents	8,448	(59,765)
Net increase in cash and cash equivalents	412,787	18,656
Cash and cash equivalents at beginning of period	1,021,033	1,293,161
Cash and cash equivalents at end of period	1,433,820	1,311,817
Supplemental cash flow information
Cash paid for interest	43,066	41,893
Income tax payments, net	$ 36,630	$ 41,797