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Customer Loans and Valuation Accounts - Allowance for Credit Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Consumer Loan      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year $ 883 $ 1,815 $ 2,251
Provision for credit losses 2,395 9,405 12,762
Charge-offs, net of recoveries from customers (3,244) (10,337) (13,198)
Balance at end of year 34 883 1,815
CSO loan      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 252 440 582
Provision for credit losses 1,764 8,056 7,057
Charge-offs, net of recoveries from customers (1,926) (8,244) (7,199)
Balance at end of year $ 90 $ 252 $ 440