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Segment Reporting (Consolidated Net Revenues by Similar Products and Services) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net revenues |  | $ 154,314 | $ 131,849 | $ 302,417 | $ 247,231
Marketplace [Member] |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net revenues |  | 93,181 | 91,517 | 187,943 | 174,960
Non-marketplace [Member] |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net revenues | [1] | $ 61,133 | $ 40,332 | $ 114,474 | $ 72,271
[1] | Includes, among other things, Ad Sales, Real Estate, Motors, Financing Fees, Off-platform Payment Fees and other ancillary services.

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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