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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in estimate of uncollectable revenues | $ 49,329 | $ 3,463 | $ 4,817
Accounts Receivable |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in estimate of uncollectable revenues | 48,240 | $ 3,463 |
Straight line rent receivables | $ 5,603 |  |

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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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