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Receivables Schedule of Changes in Allowance for Loan Losses (Details) - Delinquent FHA or VA Insured Loans [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 53,258 $ 20,571 $ 9,976
Provision 40,424 61,322 33,710
Net charge-offs and other (40,342) (28,635) (23,115)
Ending balance $ 53,340 $ 53,258 $ 20,571