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SECURED FINANCING - Mortgage Loans Payable (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Variable interest rate | 94.00% | 92.00%
Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 426,256,000 | $ 485,005,000
Mortgage principal | 429,650,000 | 490,631,000
Joint Ventures | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | 316,686,000 | 316,566,000
Mortgage principal | $ 318,302,000 | $ 318,562,000
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 | $ 16,607,000 | $ 16,029,000
Mortgage principal | $ 16,325,000 | $ 16,325,000
Variable interest rate | 2.15% | 2.15%
Virginia | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value |  | $ 82,940,000
Mortgage principal |  | $ 84,702,000
Virginia | Commercial Mortgage Loans | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 2.34%
Virginia | Commercial Mortgage Loans | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 4.55%
Virginia | Commercial Mortgage Loans | LIBOR |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 24,464,000 |
Mortgage principal | $ 25,000,000 |
Variable interest rate | 2.85% |
Texas | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 31,127,000 | $ 31,667,000
Mortgage principal | $ 32,582,000 | $ 33,167,000
Interest rate | 3.28% | 3.28%
Utah | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 6,969,000 | $ 7,077,000
Mortgage principal | $ 6,986,000 | $ 7,096,000
Interest rate | 3.69% | 3.69%
Utah | Commercial Mortgage Loans | LIBOR |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 9,706,000 | $ 9,706,000
Mortgage principal | $ 9,706,000 | $ 9,706,000
Variable interest rate | 2.75% | 3.50%
Minnesota | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 13,039,000 | $ 13,243,000
Mortgage principal | $ 13,072,000 | $ 13,276,000
Interest rate | 3.69% | 3.69%
Wisconsin | Commercial Mortgage Loans |  |
Debt Instrument [Line Items] |  |
Mortgage carrying value | $ 7,658,000 | $ 7,777,000
Mortgage principal | $ 7,677,000 | $ 7,797,000
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=120520924&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=120400017&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=120391452&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=120398452&loc=d3e534808-122878 + Details
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