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SECURED FINANCING - Mortgage Loans Payable (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Variable interest rate | 90.00% | 88.00%
Commercial Mortgage Loan |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 510,386 | $ 511,056
Debt instrument face amount | 516,113 | 516,834
Joint Ventures | Commercial Mortgage Loan |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 316,380 | 316,275
Debt instrument face amount | $ 318,664 | $ 318,664
Joint Ventures | Commercial Mortgage Loan | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.03% | 4.03%
Joint Ventures | Commercial Mortgage Loan | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.96% | 4.96%
Joint Ventures | Commercial Mortgage Loan | LIBOR |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 16,125 | $ 16,125
Debt instrument face amount | $ 16,125 | $ 16,125
Variable interest rate | 2.75% | 2.75%
Maryland | Commercial Mortgage Loan |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 95,364 | $ 95,827
Debt instrument face amount | $ 97,187 | $ 97,667
Maryland | Commercial Mortgage Loan | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.34% | 2.75%
Maryland | Commercial Mortgage Loan | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.53% | 4.96%
Texas | Commercial Mortgage Loan |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 32,060 | $ 32,189
Debt instrument face amount | $ 33,597 | $ 33,735
Interest rate | 3.28% | 3.28%
Utah | Commercial Mortgage Loan |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 9,744 | $ 9,703
Debt instrument face amount | $ 9,706 | $ 9,706
Interest rate | 3.69% | 3.69%
Utah | Commercial Mortgage Loan | LIBOR |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 7,156 | $ 7,279
Debt instrument face amount | $ 7,175 | $ 7,201
Variable interest rate | 3.50% | 3.50%
Minnesota | Commercial Mortgage Loan |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 13,390 | $ 13,438
Debt instrument face amount | $ 13,425 | $ 13,473
Interest rate | 3.69% | 3.69%
Tennessee | Commercial Mortgage Loan |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 12,303 | $ 12,328
Debt instrument face amount | $ 12,350 | $ 12,350
Interest rate | 4.01% | 4.01%
Wisconsin | Commercial Mortgage Loan |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 7,864 | $ 7,892
Debt instrument face amount | $ 7,884 | $ 7,913
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/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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