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Segment Reporting (Consolidated Net Revenues by Similar Products and Services) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net revenues $ 355,281 $ 304,921 $ 1,011,634 $ 858,479
Enchanced Marketplace [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net revenues 180,319 181,140 477,216 539,079
Non-marketplace [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Net revenues 174,962 123,781 534,418 319,400
Payment fees $ 143,925 $ 92,254 $ 432,603 $ 232,426