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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment Useful Lives and Impairment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property and Equipment |  |  |
Impairment charge | $ 0 | $ 0 | $ 0
Site improvements | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful life | 15 years |  |
Site improvements | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful life | 40 years |  |
Buildings | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful life | 30 years |  |
Buildings | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful life | 40 years |  |
Building improvements | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful life | 5 years |  |
Building improvements | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful life | 40 years |  |
Furniture and equipment | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful life | 5 years |  |
Furniture and equipment | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful life | 10 years |  |
Equipment | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful life | 3 years |  |
Equipment | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful life | 20 years |  |

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + 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 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Details
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- Details
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