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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Accrued Merchant and Supplier Payables (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]    
Accrued merchant payables $ 395,085 $ 459,662
Accrued supplier payables (1) [1] 173,485 310,673
Total accrued merchant and supplier payables $ 568,570 $ 770,335
[1] (1)Amounts include payables to suppliers of inventories and providers of shipping and fulfillment services.