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Receivables - Schedule of Changes in allowance of Government-Insured Loan Claims (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance $ 7,700  
Ending balance 2,800  
Government Insured Loans Claims [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 53,340 $ 53,258
Provision 10,376 11,885
Net charge-offs and other (6,123) (23,705)
Ending balance $ 57,593 $ 41,438