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Customer Loans and Valuation Accounts - Allowance for Credit Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year $ 1,815    
Balance at end of year 883 $ 1,815  
Consumer Loan      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 1,815 2,251 $ 66
Provision for credit losses 9,405 12,762 6,049
Charge-offs, net of recoveries from customers (10,337) (13,198) (3,864)
Balance at end of year 883 1,815 2,251
CSO loan      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 440 582 498
Provision for credit losses 8,056 7,057 5,944
Charge-offs, net of recoveries from customers (8,244) (7,199) (5,860)
Balance at end of year $ 252 $ 440 $ 582