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Schedule IV - Mortgage Loans on Real Estate - Mortgage Loans on Real Estate (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Face Amount of Mortgages or Maximum Available Credit $ 31,136 [1]
Carrying Amount of Mortgages 23,197 [1],[2]
Capitalized loan costs 6 [1],[2]
Mortgages [Member]  
Face Amount of Mortgages or Maximum Available Credit 30,536 [1]
Carrying Amount of Mortgages $ 22,784 [1],[2]
Borrower A [Member] | Mortgages [Member]  
Interest Accrual Rates 5.00%
Interest Payment Rates 5.00%
Final Maturity Date Jul. 31, 2017
Face Amount of Mortgages or Maximum Available Credit $ 5,730 [1]
Carrying Amount of Mortgages $ 5,314 [1],[2]
Borrower B [Member] | Mortgages [Member]  
Interest Accrual Rates 6.50%
Interest Payment Rates 6.50%
Final Maturity Date Mar. 04, 2033
Face Amount of Mortgages or Maximum Available Credit $ 5,014 [1]
Carrying Amount of Mortgages $ 5,014 [1],[2]
Borrower C [Member] | Mortgages [Member]  
Interest Accrual Rates 12.00%
Interest Payment Rates 12.00%
Final Maturity Date May 14, 2033
Face Amount of Mortgages or Maximum Available Credit $ 3,075 [1]
Carrying Amount of Mortgages $ 3,075 [1],[2]
Borrower D [Member] | Mortgages [Member]  
Interest Accrual Rates 7.57%
Interest Payment Rates 7.57%
Final Maturity Date Jun. 01, 2019
Face Amount of Mortgages or Maximum Available Credit $ 3,966 [1]
Carrying Amount of Mortgages $ 2,078 [1],[2]
Borrower E [Member] | Mortgages [Member]  
Interest Accrual Rates 7.57%
Interest Payment Rates 7.57%
Final Maturity Date Jun. 01, 2019
Face Amount of Mortgages or Maximum Available Credit $ 4,201 [1]
Carrying Amount of Mortgages $ 2,037 [1],[2]
Borrower F [Member] | Mortgages [Member]  
Interest Accrual Rates 7.57%
Interest Payment Rates 7.57%
Final Maturity Date Jun. 01, 2019
Face Amount of Mortgages or Maximum Available Credit $ 3,678 [1]
Carrying Amount of Mortgages $ 1,923 [1],[2]
Borrower G [Member] | Mortgages [Member]  
Interest Accrual Rates 6.00%
Interest Payment Rates 6.00%
Final Maturity Date Dec. 09, 2024
Face Amount of Mortgages or Maximum Available Credit $ 1,950 [1]
Carrying Amount of Mortgages $ 1,950 [1],[2]
Individually Less Than 3% [Member] | Mortgages [Member]  
Interest Accrual Rates [3]
Interest Payment Rates [3]
Final Maturity Date [4]
Face Amount of Mortgages or Maximum Available Credit $ 2,922 [1]
Carrying Amount of Mortgages $ 1,393 [1],[2]
Individually Less Than 3% [Member] | Other Loans on Real Estate [Member]  
Interest Accrual Rates 2.28%
Interest Payment Rates 2.28%
Final Maturity Date Apr. 01, 2027
Face Amount of Mortgages or Maximum Available Credit $ 600 [1]
Carrying Amount of Mortgages $ 407 [1],[2]
[1] The instruments actual cash flows are denominated in U.S. dollars and Canadian dollars as indicated by the geographic location above
[2] The aggregate cost for Federal income tax purposes is $23.2 million
[3] Interest rates range from 6.88% to 9.00%
[4] Maturity dates range from October 19, 2019 to December 1, 2030