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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 |  |  |

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. + Details
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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of the contractual principal due at the origination of the mortgage loan (face amount). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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- Definition The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of prior lien on the real estate that secures the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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- Definition Amount of reserve for write-down of a mortgage loan on real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.7) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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