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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, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 802,421
Carrying Amount of Mortgages	752,129	$ 915,905	$ 934,964	$ 726,426
Reserves on impaired loans	48,500
Borrower A
Mortgage Loans on Real Estate [Line Items]
Prior Liens	0
Face Amount of Mortgages	200,000
Carrying Amount of Mortgages	$ 199,000
Borrower A | Contractual Interest Accrual Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	5.25%
Borrower A | Contractual Interest Payment Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	5.25%
Borrower A | Minimum
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	0.18%
Borrower B
Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	107,196
Carrying Amount of Mortgages	$ 107,202
Borrower B | Contractual Interest Accrual Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	5.15%
Borrower B | Contractual Interest Payment Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	5.15%
Borrower C
Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	93,782
Carrying Amount of Mortgages	$ 93,596
Borrower C | Contractual Interest Accrual Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	8.00%
Borrower C | Contractual Interest Payment Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	8.00%
Borrower D
Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	86,000
Carrying Amount of Mortgages	$ 86,714
Borrower D | Contractual Interest Accrual Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	6.00%
Borrower D | Contractual Interest Payment Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	6.00%
Borrower D | Minimum
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	0.42%
Borrower E
Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	39,729
Carrying Amount of Mortgages	$ 39,748
Borrower E | Contractual Interest Accrual Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	7.25%
Borrower E | Contractual Interest Payment Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	7.25%
Borrower F
Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	30,338
Carrying Amount of Mortgages	$ 30,308
Borrower F | Contractual Interest Accrual Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	5.88%
Borrower F | Contractual Interest Payment Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	5.88%
Borrower F | Minimum
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	0.25%
Borrower G
Mortgage Loans on Real Estate [Line Items]
Prior Liens	$ 0
Face Amount of Mortgages	25,424
Carrying Amount of Mortgages	$ 25,201
Borrower G | Contractual Interest Accrual Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	8.00%
Borrower G | Contractual Interest Payment Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	8.00%
Senior Mortgages Individually Less than 3 Percent
Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 210,457
Carrying Amount of Mortgages	$ 160,865
Senior Mortgages Individually Less than 3 Percent | Minimum | Contractual Interest Accrual Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	3.00%
Contractual interest rate (as a percent)	5.00%
Senior Mortgages Individually Less than 3 Percent | Minimum | Contractual Interest Payment Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	3.00%
Contractual interest rate (as a percent)	6.00%
Senior Mortgages Individually Less than 3 Percent | Maximum | Contractual Interest Accrual Rates
Mortgage Loans on Real Estate [Line Items]
Variable spread on LIBOR (as a percent)	12.35%
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 (as a percent)	12.35%
Contractual interest rate (as a percent)	9.68%
Senior Mortgages
Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 792,926
Carrying Amount of Mortgages	742,634
Subordinate Mortgages Individually Less than 3 Percent
Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	9,495
Carrying Amount of Mortgages	$ 9,495
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)	6.80%
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)	14.00%
Subordinate Mortgages
Mortgage Loans on Real Estate [Line Items]
Face Amount of Mortgages	$ 9,495
Carrying Amount of Mortgages	$ 9,495

X

- Definition

The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

+ References

No definition available.

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The carrying amount of the outstanding balance due under the mortgage loan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
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Amount of the contractual principal due at the origination of the mortgage loan (face amount).

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The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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Amount of prior lien on the real estate that secures the mortgage loan.

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Amount of reserve for write-down of a mortgage loan on real estate.

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