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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Face Amount of Mortgages | $ 790,094 |  |  |
Carrying Amount of Mortgages | 730,515 | $ 752,129 | $ 915,905 | $ 934,964
Reserves on impaired loans | 40,400 |  |  |
Borrower A |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | 0 |  |  |
Face Amount of Mortgages | 107,196 |  |  |
Carrying Amount of Mortgages | $ 107,427 |  |  |
Borrower A | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.15% |  |  |
Borrower A | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.15% |  |  |
Borrower B |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 88,612 |  |  |
Carrying Amount of Mortgages | $ 88,114 |  |  |
Borrower B | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.25% |  |  |
Borrower B | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.25% |  |  |
Borrower C |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 84,000 |  |  |
Carrying Amount of Mortgages | $ 84,959 |  |  |
Borrower C | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 6.00% |  |  |
Borrower C | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 6.00% |  |  |
Borrower D |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 71,934 |  |  |
Carrying Amount of Mortgages | $ 71,120 |  |  |
Borrower D | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 6.00% |  |  |
Borrower D | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 6.00% |  |  |
Borrower E |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 31,039 |  |  |
Carrying Amount of Mortgages | $ 31,017 |  |  |
Borrower E | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 4.00% |  |  |
Borrower E | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 4.00% |  |  |
Borrower F |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 30,833 |  |  |
Carrying Amount of Mortgages | $ 30,432 |  |  |
Borrower F | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 4.75% |  |  |
Borrower F | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 4.75% |  |  |
Borrower G |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 29,252 |  |  |
Carrying Amount of Mortgages | $ 29,085 |  |  |
Borrower G | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 6.00% |  |  |
Borrower G | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 6.00% |  |  |
Borrower H |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 27,274 |  |  |
Carrying Amount of Mortgages | $ 27,019 |  |  |
Borrower H | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.75% |  |  |
Borrower H | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.75% |  |  |
Borrower I |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 27,000 |  |  |
Carrying Amount of Mortgages | $ 26,828 |  |  |
Borrower I | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 7.50% |  |  |
Borrower I | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 7.50% |  |  |
Senior Mortgages Individually Less than 3 Percent |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Face Amount of Mortgages | $ 282,469 |  |  |
Carrying Amount of Mortgages | $ 224,353 |  |  |
Senior Mortgages Individually Less than 3 Percent | Minimum | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 5.00% |  |  |
Senior Mortgages Individually Less than 3 Percent | Minimum | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 6.00% |  |  |
Senior Mortgages Individually Less than 3 Percent | Maximum | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 9.68% |  |  |
Senior Mortgages Individually Less than 3 Percent | Maximum | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 9.68% |  |  |
Senior Mortgages Individually Less than 3 Percent | LIBOR | Minimum | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 3.00% |  |  |
Senior Mortgages Individually Less than 3 Percent | LIBOR | Minimum | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 3.00% |  |  |
Senior Mortgages Individually Less than 3 Percent | LIBOR | Maximum | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 7.50% |  |  |
Senior Mortgages Individually Less than 3 Percent | LIBOR | Maximum | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 7.50% |  |  |
Senior Mortgages |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Face Amount of Mortgages | $ 779,609 |  |  |
Carrying Amount of Mortgages | 720,354 |  |  |
Subordinate Mortgages Individually Less than 3 Percent |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Face Amount of Mortgages | 10,485 |  |  |
Carrying Amount of Mortgages | $ 10,161 |  |  |
Subordinate Mortgages Individually Less than 3 Percent | Minimum | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 6.80% |  |  |
Subordinate Mortgages Individually Less than 3 Percent | Minimum | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 6.80% |  |  |
Subordinate Mortgages Individually Less than 3 Percent | Maximum | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 14.00% |  |  |
Subordinate Mortgages Individually Less than 3 Percent | Maximum | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 14.00% |  |  |
Subordinate Mortgages |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Face Amount of Mortgages | $ 10,485 |  |  |
Carrying Amount of Mortgages | $ 10,161 |  |  |

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- Definition Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column F -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column F)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column B)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of prior lien on real estate securing mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column E -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column E)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- 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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