CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities:
Net income (loss)	$ (44,353)	$ 103,807
Less: Discontinued operations, net of tax		(23,889)
Net income (loss) from continuing operations	(44,353)	127,696
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by operating activities:
Depreciation of property and equipment, including internal-use software and website development	100,005	72,980
Amortization of stock-based compensation	91,164	33,572
Amortization of intangible assets	31,407	12,053
Deferred income taxes	25,012	8,556
Foreign exchange (gain) loss on cash, cash equivalents and short-term investments, net	84,299	14,522
Realized (gain) loss on foreign currency forwards	(24,189)	(10,460)
Other	10,871	14,772
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(207,418)	(142,121)
Prepaid expenses and other current assets	(56,372)	(13,494)
Accounts payable, merchant	301,568	193,080
Accounts payable, other, accrued expenses and other current liabilities	(75,021)	123,754
Deferred merchant bookings	948,749	958,066
Deferred revenue	13,886	7,619
Net cash provided by operating activities from continuing operations	1,199,608	1,400,595
Investing activities:
Capital expenditures, including internal-use software and website development	(157,840)	(117,217)
Purchases of investments	(1,129,789)	(1,007,745)
Sales and maturities of investments	772,817	674,315
Acquisitions, net of cash acquired	(540,489)	(199,267)
Net settlement of foreign currency forwards	24,189	10,460
Other, net	(43)	(1,999)
Net cash used in investing activities from continuing operations	(1,031,155)	(641,453)
Financing activities:
Purchases of treasury stock	(134,238)	(297,704)
Proceeds from issuance of treasury stock	25,273
Payment of dividends to stockholders	(35,621)	(24,409)
Proceeds from exercise of equity awards	34,613	224,770
Excess tax benefit on equity awards	28,827	16,920
Other, net	(8,886)	(5,466)
Net cash provided by (used in) financing activities from continuing operations	(90,032)	(85,889)
Net cash provided by continuing operations	78,421	673,253
Net cash used in discontinued operations		(7,607)
Effect of exchange rate changes on cash and cash equivalents	(59,765)	(11,434)
Net increase in cash and cash equivalents	18,656	654,212
Cash and cash equivalents at beginning of period	1,293,161	689,134
Cash and cash equivalents at end of period	1,311,817	1,343,346
Supplemental cash flow information
Cash paid for interest from continuing operations	41,893	43,441
Income tax payments (refunds), net from continuing operations	$ 41,797	$ (3,597)