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Advances - Schedule of Changes in Allowance for Losses (Footnote) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for losses $ 6,078 $ 7,820 $ 9,925 $ 9,297 $ 27,653 $ 23,259
Sold Advances            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for losses       $ 18,000