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SECURED FINANCING - Mortgage Loans Payable (Details) - Commercial Mortgage Loans - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Mortgage Carrying Value	$ 507,934,000	$ 485,005,000
Mortgage Principal	513,182,000	490,631,000
Joint Ventures
Debt Instrument [Line Items]
Mortgage Carrying Value	316,661,000	316,566,000
Mortgage Principal	$ 318,371,000	$ 318,562,000
Joint Ventures | Minimum
Debt Instrument [Line Items]
Interest Rate	4.03%	4.03%
Joint Ventures | Maximum
Debt Instrument [Line Items]
Interest Rate	4.96%	4.96%
Joint Ventures | LIBOR
Debt Instrument [Line Items]
Mortgage Carrying Value	$ 16,575,000	$ 16,029,000
Mortgage Principal	$ 16,325,000	$ 16,325,000
Variable interest rate	2.15%	2.15%
Virginia
Debt Instrument [Line Items]
Mortgage Carrying Value	$ 81,498,000	$ 82,940,000
Mortgage Principal	$ 83,204,000	$ 84,702,000
Virginia | Minimum
Debt Instrument [Line Items]
Interest Rate	2.34%	2.34%
Virginia | Maximum
Debt Instrument [Line Items]
Interest Rate	4.55%	4.55%
Virginia | LIBOR
Debt Instrument [Line Items]
Mortgage Carrying Value	$ 24,457,000
Mortgage Principal	$ 25,000,000
Variable interest rate	2.85%
Texas
Debt Instrument [Line Items]
Mortgage Carrying Value	$ 31,263,000	$ 31,667,000
Mortgage Principal	$ 32,730,000	$ 33,167,000
Interest Rate	3.28%	3.28%
Utah
Debt Instrument [Line Items]
Mortgage Carrying Value	$ 6,996,000	$ 7,077,000
Mortgage Principal	$ 7,014,000	$ 7,096,000
Interest Rate	3.69%	3.69%
Utah | 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
Debt Instrument [Line Items]
Mortgage Carrying Value	$ 13,090,000	$ 13,243,000
Mortgage Principal	$ 13,124,000	$ 13,276,000
Interest Rate	3.69%	3.69%
Wisconsin
Debt Instrument [Line Items]
Mortgage Carrying Value	$ 7,688,000	$ 7,777,000
Mortgage Principal	$ 7,708,000	$ 7,797,000
Interest Rate	3.69%	3.69%

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No definition available.

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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
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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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