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Schedule IV - Mortgage Loans on Real Estate - Schedule of Mortgage Loans on Real Estate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]        
Face Amount of Mortgages $ 966,709      
Carrying Amount of Mortgages 915,905 $ 934,964 $ 726,426 $ 827,796
Reserves on impaired loans 49,800      
Borrower A        
Mortgage Loans on Real Estate [Line Items]        
Prior Liens 0      
Face Amount of Mortgages 236,504      
Carrying Amount of Mortgages $ 237,291      
Borrower A | Contractual Interest Accrual Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 6.75%      
Borrower A | Contractual Interest Payment Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 6.75%      
Borrower A | Minimum        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 0.19%      
Borrower B        
Mortgage Loans on Real Estate [Line Items]        
Prior Liens $ 0      
Face Amount of Mortgages 168,901      
Carrying Amount of Mortgages $ 168,213      
Borrower B | Contractual Interest Accrual Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 5.25%      
Borrower B | Contractual Interest Payment Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 5.25%      
Borrower C        
Mortgage Loans on Real Estate [Line Items]        
Prior Liens $ 0      
Face Amount of Mortgages 128,445      
Carrying Amount of Mortgages $ 129,062      
Borrower C | Contractual Interest Accrual Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 6.00%      
Borrower C | Contractual Interest Payment Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 6.00%      
Borrower D        
Mortgage Loans on Real Estate [Line Items]        
Prior Liens $ 0      
Face Amount of Mortgages 86,000      
Carrying Amount of Mortgages $ 86,321      
Borrower D | Contractual Interest Accrual Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 6.00%      
Borrower D | Contractual Interest Payment Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 6.00%      
Borrower D | Minimum        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 0.18%      
Borrower E        
Mortgage Loans on Real Estate [Line Items]        
Prior Liens $ 0      
Face Amount of Mortgages 57,424      
Carrying Amount of Mortgages $ 56,673      
Borrower E | Contractual Interest Accrual Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 8.00%      
Borrower E | Contractual Interest Payment Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 8.00%      
Borrower F        
Mortgage Loans on Real Estate [Line Items]        
Prior Liens $ 0      
Face Amount of Mortgages 36,860      
Carrying Amount of Mortgages $ 37,004      
Borrower F | Contractual Interest Accrual Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 6.50%      
Borrower F | Contractual Interest Payment Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 6.50%      
Borrower F | Minimum        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 0.25%      
Senior Mortgages Individually Less than 3 Percent        
Mortgage Loans on Real Estate [Line Items]        
Face Amount of Mortgages $ 227,650      
Carrying Amount of Mortgages $ 176,400      
Senior Mortgages Individually Less than 3 Percent | Minimum | Contractual Interest Accrual Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 3.00%      
Contractual interest rate (as a percent) 4.00%      
Senior Mortgages Individually Less than 3 Percent | Minimum | Contractual Interest Payment Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 3.00%      
Contractual interest rate (as a percent) 4.00%      
Senior Mortgages Individually Less than 3 Percent | Maximum | Contractual Interest Accrual Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 7.50%      
Contractual interest rate (as a percent) 9.68%      
Senior Mortgages Individually Less than 3 Percent | Maximum | Contractual Interest Payment Rates        
Mortgage Loans on Real Estate [Line Items]        
Variable spread on LIBOR 7.50%      
Contractual interest rate (as a percent) 9.68%      
Senior Mortgages        
Mortgage Loans on Real Estate [Line Items]        
Face Amount of Mortgages $ 941,784      
Carrying Amount of Mortgages 890,964      
Subordinate Mortgages Individually Less than 3 Percent        
Mortgage Loans on Real Estate [Line Items]        
Face Amount of Mortgages 24,925      
Carrying Amount of Mortgages $ 24,941      
Subordinate Mortgages Individually Less than 3 Percent | Minimum | Contractual Interest Accrual Rates        
Mortgage Loans on Real Estate [Line Items]        
Contractual interest rate (as a percent) 6.80%      
Subordinate Mortgages Individually Less than 3 Percent | Minimum | Contractual Interest Payment Rates        
Mortgage Loans on Real Estate [Line Items]        
Contractual interest rate (as a percent) 8.33%      
Subordinate Mortgages Individually Less than 3 Percent | Maximum | Contractual Interest Accrual Rates        
Mortgage Loans on Real Estate [Line Items]        
Contractual interest rate (as a percent) 14.00%      
Subordinate Mortgages Individually Less than 3 Percent | Maximum | Contractual Interest Payment Rates        
Mortgage Loans on Real Estate [Line Items]        
Contractual interest rate (as a percent) 9.09%      
Subordinate Mortgages        
Mortgage Loans on Real Estate [Line Items]        
Face Amount of Mortgages $ 24,925      
Carrying Amount of Mortgages $ 24,941