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Debt (Details 2) - Mortgage loans - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Carrying value of mortgages $ 179,808 $ 127,559
Bond principal balance 116,349 84,679
Original balances at securitization cutoff date Mortgage UPB 248,775  
Original balances at securitization cutoff date Bond principal balance 121,834  
2014-A    
Debt Instrument [Line Items]    
Carrying value of mortgages 58,313 58,905
Bond principal balance 41,681 44,016
Original balances at securitization cutoff date Mortgage UPB 81,405  
Original balances at securitization cutoff date Bond principal balance 45,000  
2014-B    
Debt Instrument [Line Items]    
Carrying value of mortgages 68,379 68,654
Bond principal balance 39,344 $ 40,663
Original balances at securitization cutoff date Mortgage UPB 91,535  
Original balances at securitization cutoff date Bond principal balance 41,191  
2015-A    
Debt Instrument [Line Items]    
Carrying value of mortgages 53,116  
Bond principal balance 35,324  
Original balances at securitization cutoff date Mortgage UPB 75,835  
Original balances at securitization cutoff date Bond principal balance $ 35,643