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Receivables - Schedule of Changes in allowance of Government-Insured Loan Claims (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance     $ 7,700  
Government Insured Loans Claims [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance $ 57,593 $ 41,438 53,340 $ 53,258
Provision 8,658 9,467 19,034 19,907
Net charge-offs and other (13,096) (4,328) (19,219) (26,588)
Ending balance $ 53,155 $ 46,577 $ 53,155 $ 46,577