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REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS - Minimum Future Rents and Unbilled Rent Receivable (Details) | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) property | Sep. 30, 2018 USD ($)
Minimum future contractual rents to be received |  |  |  |  |
2019 | $ 66,959,000 |  |  |  |
2020 | 66,691,000 |  |  |  |
2021 | 65,130,000 |  |  |  |
2022 | 56,444,000 |  |  |  |
2023 | 47,644,000 |  |  |  |
Thereafter | 208,923,000 |  |  |  |
Total | 511,791,000 |  |  |  |
Unbilled Rent Receivable |  |  |  |  |
Unbilled rent receivable | $ 13,722,000 | $ 14,125,000 |  | $ 14,125,000 |
Period during which amount of unbilled rent receivable is to be billed and received | 23 years |  |  |  |
Unbilled straight-line rent receivable written off related to property sold | $ 45,000 | 105,000 |  |  |
Unbilled rent straight-line rent receivable written off related to tenant filed bankruptcy |  | $ 362,000 | $ 7,000 |  |
Number of Properties with Tenants In Bankruptcy, Unbilled Straight-Line Rent Receivables | property |  |  |  | 5 |
Unbilled straight-line rent receivable written off related to lease termination fees | 74,000 |  |  |  |
Texas |  |  |  |  |
Unbilled Rent Receivable |  |  |  |  |
Allowance for doubtful collections of unbilled rent receivables |  |  |  |  | $ 1,440,000
Unbilled rent straight-line rent receivable written off related to tenant filed bankruptcy | $ 1,440,000 |  |  |  |

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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77913719&loc=d3e40879-112712 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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