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Securitizations and Variable Interests Entities - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Servicing Assets at Fair Value [Line Items]      
Average period to securitization 30 days    
Total Financing liabilities $ 4,012,812 $ 3,089,255  
Loans held for investment - Reverse mortgages 3,565,716 2,488,253  
Forward Loans [Member]      
Servicing Assets at Fair Value [Line Items]      
MSRs retained $ 37,200 $ 36,000 $ 39,800
Percentage of transferred residential loans serviced 60 days or more past due 7.60% 8.20%  
Charge-offs, net of recovers, associated with transferred residential loans serviced 60 days or more past due $ 300 $ 500  
HECM [Member]      
Servicing Assets at Fair Value [Line Items]      
Loans held for investment - Reverse mortgages 3,600,000 2,500,000  
Loans held for investment - Reverse mortgages, not pledged as collateral $ 81,300    
Minimum [Member] | Forward Loans [Member]      
Servicing Assets at Fair Value [Line Items]      
Number of days that transferred residential loans serviced were past due 60 days    
HMBS - Related Borrowings [Member]      
Servicing Assets at Fair Value [Line Items]      
Total Financing liabilities $ 3,400,000 $ 2,400,000