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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Real Estate Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Finite Lived Intangible Assets [Line Items] |  |  |
Net amortization expense of acquired intangibles | $ 1,460 | $ 4,506 | $ 13,282
Future amortization expense, 2021 | 1,326 |  |
Future amortization expense, 2022 | 1,071 |  |
Future amortization expense, 2023 | 872 |  |
Future amortization expense, 2024 | 854 |  |
Future amortization expense, 2025 | 817 |  |
Interest expense capitalized | 1,640 | 2,504 | $ 3,225
Intangible Lease Assets And Other Assets | Above-market/Below-market leases |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 18,416 | 21,098 |
Intangible lease assets and liabilities, Accumulated Amortization | (16,395) | (18,559) |
Intangible Lease Assets And Other Assets | In-place leases |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 59,472 | 66,309 |
Intangible lease assets and liabilities, Accumulated Amortization | (53,790) | (58,559) |
Intangible Lease Assets And Other Assets | Tenant relationships |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 34,630 | 38,880 |
Intangible lease assets and liabilities, Accumulated Amortization | (7,909) | (10,834) |
Accounts Payable and Accrued Liabilities | Above-market/Below-market leases |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible lease assets and liabilities, Cost | 42,274 | 46,554 |
Intangible lease assets and liabilities, Accumulated Amortization | $ (36,224) | $ (38,052) |
Buildings |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 40 years |  |
Certain Improvements | Minimum |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 10 years |  |
Certain Improvements | Maximum |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 20 years |  |
Equipment and Fixtures | Minimum |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 7 years |  |
Equipment and Fixtures | Maximum |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated useful life | 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=121586364&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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