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SECURED FINANCING - Mortgage Loans Payable (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Variable interest rate | 92.00% | 88.00%
Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 485,005,000 | $ 511,056,000
Mortgage principal | 490,631,000 | 516,834,000
Joint Ventures | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | 316,566,000 | 316,275,000
Mortgage principal | $ 318,562,000 | $ 318,664,000
Joint Ventures | Commercial Mortgage Loans | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.03% | 4.03%
Joint Ventures | Commercial Mortgage Loans | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.96% | 4.96%
Joint Ventures | Commercial Mortgage Loans | LIBOR |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 16,029,000 | $ 16,125,000
Mortgage principal | $ 16,325,000 | 16,125,000
Variable interest rate | 2.15% |
Virginia | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 82,940,000 | 95,827,000
Mortgage principal | $ 84,702,000 | $ 97,667,000
Virginia | Commercial Mortgage Loans | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.34% | 2.75%
Virginia | Commercial Mortgage Loans | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.55% | 4.96%
Texas | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 31,667,000 | $ 32,189,000
Mortgage principal | $ 33,167,000 | $ 33,735,000
Interest rate | 3.28% | 3.28%
Utah | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 7,077,000 | $ 7,279,000
Mortgage principal | $ 7,096,000 | $ 7,201,000
Interest rate | 3.69% | 3.69%
Utah | Commercial Mortgage Loans | LIBOR |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 9,706,000 | $ 9,703,000
Mortgage principal | $ 9,706,000 | $ 9,706,000
Variable interest rate | 3.50% | 3.50%
Minnesota | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 13,243,000 | $ 13,438,000
Mortgage principal | $ 13,276,000 | $ 13,473,000
Interest rate | 3.69% | 3.69%
Tennessee | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value |  | $ 12,328,000
Mortgage principal |  | $ 12,350,000
Interest rate |  | 4.01%
Tennessee | Commercial Mortgage Loans | LIBOR |  |
Debt Instrument [Line Items] |  |
Variable interest rate |  | 2.75%
Wisconsin | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 7,777,000 | $ 7,892,000
Mortgage principal | $ 7,797,000 | $ 7,913,000
Interest rate | 3.69% | 3.69%

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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