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Customer Loans and Valuation Accounts Allowance for Credit Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year $ 66    
Balance at end of year 2,251 $ 66  
Consumer Loan      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 66 81 $ 84
Provision for credit losses 6,049 808 1,207
Charge-offs, net of recoveries from customers (3,864) (823) (1,210)
Balance at end of year 2,251 66 81
CSO loan      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 498 493 580
Provision for credit losses 5,944 6,351 8,080
Charge-offs, net of recoveries from customers (5,860) (6,346) (8,167)
Balance at end of year $ 582 $ 498 $ 493