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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Real Estate Assets (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ 4,506,000 | $ 13,282,000 | $ 13,256,000
Future amortization expense, 2020 | 1,848,000 |  |
Future amortization expense, 2021 | 1,256,000 |  |
Future amortization expense, 2022 | 1,003,000 |  |
Future amortization expense, 2023 | 804,000 |  |
Future amortization expense, 2024 | 786,000 |  |
Interest expense capitalized | 2,504,000 | 3,225,000 | $ 2,314,000
Intangible Lease Assets And Other Assets | Above-market/Below-market leases |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Cost | 21,098,000 | 28,165,000 |
Intangible lease assets and liabilities, Accumulated Amortization | (18,559,000) | (24,890,000) |
Intangible Lease Assets And Other Assets | In-place leases |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Cost | 66,309,000 | 92,750,000 |
Intangible lease assets and liabilities, Accumulated Amortization | (58,559,000) | (78,796,000) |
Intangible Lease Assets And Other Assets | Tenant relationships |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Cost | 38,880,000 | 41,561,000 |
Intangible lease assets and liabilities, Accumulated Amortization | (10,834,000) | (10,135,000) |
Accounts Payable and Accrued Liabilities | Above-market/Below-market leases |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Cost | 46,554,000 | 63,719,000 |
Intangible lease assets and liabilities, Accumulated Amortization | $ (38,052,000) | $ (50,146,000) |
Buildings |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Useful life of property, plant and equipment | 40 years |  |
Certain Improvements | Minimum |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Useful life of property, plant and equipment | 10 years |  |
Certain Improvements | Maximum |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Useful life of property, plant and equipment | 20 years |  |
Equipment and Fixtures | Minimum |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Useful life of property, plant and equipment | 7 years |  |
Equipment and Fixtures | Maximum |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Useful life of property, plant and equipment | 10 years |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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