Consolidated Statements of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net loss		$ (97,327)	$ 101,457
Less: Income (loss) from discontinued operations		0	133,463
Loss from continuing operations		(97,327)	(32,006)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation, Depletion and Amortization		59,852	53,766
Amortization of acquired intangible assets		9,235	9,806
Share-based Compensation	[1]	68,308	73,629
Restructuring Costs and Asset Impairment Charges		45	0
Gain (Loss) on Disposition of Business		(9,339)	0
Deferred income taxes		(5,148)	(50)
Gain from changes in fair value of contingent consideration	[2]	4,292	(703)
Fair Value, Option, Changes in Fair Value, Gain (Loss)		5,707	(450)
Amortization of Debt Discount (Premium)		2,396	0
Change in assets and liabilities, net of acquisitions:
Restricted cash		(693)	3,163
Accounts receivable		1,205	(10,282)
Prepaid expenses and other current assets		(33,528)	(6,447)
Accounts payable		(7,157)	(6,315)
Accrued merchant and supplier payables		(125,462)	(50,533)
Accrued expenses and other current liabilities		3,935	6,045
Other, net		(7,056)	17,309
Net cash provided by (used in) operating activities from continuing operations		(130,735)	56,932
Net cash used in operating activities from discontinued operations		0	(17,373)
Net cash provided by (used in) operating activities		(130,735)	39,559
Investing activities
Purchases of property and equipment and capitalized software		(36,347)	(40,746)
Cash Divested from Deconsolidation		(352)	0
Acquisitions of businesses, net of acquired cash		(940)	(3,120)
Payments to Acquire Investments		0	(5,000)
Proceeds from Sale of Investment Projects		0	1,231
Settlements of liabilities related to purchase of additional interest in consolidated subsidiary		0	(349)
Purchases of intangible assets		(1,992)	0
Net cash used in investing activities from continuing operations		(39,631)	(47,984)
Net cash used in investing activities from discontinued operations		0	244,470
Net cash used in investing activities		(39,631)	196,486
Financing activities
Proceeds from Convertible Debt		250,000	0
Payments of Debt Issuance Costs		(8,097)	0
Payments for Hedge, Financing Activities		59,163
Payments for Derivative Instrument, Financing Activities			0
Proceeds from Issuance of Warrants		35,495	0
Payments for purchases of treasury stock		(90,449)	(136,115)
Taxes paid related to net share settlements of stock-based compensation awards		(16,535)	(27,301)
Proceeds from stock option exercises and employee stock purchase plan		2,047	2,199
Partnership distribution payments to noncontrolling interest holders		(7,127)	(7,894)
Payment of Contingent Consideration		(285)	(382)
Payments of capital lease obligations		(14,676)	(7,902)
Net cash used in financing activities		91,210	(177,395)
Effect of exchange rate changes on cash and cash equivalents		5,926	(20,415)
Net decrease in cash and cash equivalents, including cash classified within current assets held for sale		(73,230)	38,235
Less: Increase in cash and cash equivalents classified within current assets held for sale		0	(55,279)
Net decrease in cash and cash equivalents		(73,230)	93,514
Cash and cash equivalents, beginning of period		853,362	1,016,634
Cash and cash equivalents, end of period		780,132
Non-cash investing and financing activities
Equipment acquired under capital lease obligations		10,081	7,245
Payments for Tenant Improvements		4,990	0
Liability for Purchases of Treasury Stock		1,592	5,418
Accounts payable and accrued expenses related to purchases of property and equipment and capitalized software		3,850	2,598
Noncash or Part Noncash Acquisition, Investments Acquired		0	122,075
Continuing Operations [Member]
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Share-based Compensation			73,600
Discontinued Operations [Member]
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Share-based Compensation			5,300
Breadcrumb [Member]
Non-cash investing and financing activities
Noncash or Part Noncash Acquisition, Investments Acquired		$ 8,323	$ 0

[1] Includes stock-based compensation classified within cost of revenue, marketing expense, selling, general and administrative expense and restructuring charges. Other income (expense), net, includes $0.2 million and $0.4 million of additional stock-based compensation for the three and six months ended June 30, 2016 and $0.02 million for the three and six months ended June 30, 2015.

[2] Changes in the fair value of contingent consideration liabilities are classified within "Acquisition-related expense (benefit), net" on the condensed consolidated statements of operations.