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Receivables - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Delinquent FHA or VA Insured Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for losses related to defaulted FHA or VA insured loans $ 53,340 $ 53,258 $ 20,571 $ 9,976