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Summary of Significant Accounting Policies and Procedures and Newly Adopted Accounting Standards - Provision For Impairment (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property | Sep. 30, 2020 USD ($)
Provisions for Impairment |  |  |  |
Number of properties owned | 6,592 |  |  |
Provisions for impairment | $ | $ 147,232 | $ 40,186 | $ 26,269 |
Number of impaired properties held for sale | 6 | 1 | 0 |
Number of impaired properties held for investment | 42 | 5 | 3 |
Number of impaired properties sold | 51 | 45 | 41 |
Value of properties | $ | $ 14,696,712 | $ 13,833,882 |  |
Held for sale |  |  |  |
Provisions for Impairment |  |  |  |
Number of properties owned | 21 |  |  |
COVID-19 impacted properties |  |  |  |
Provisions for Impairment |  |  |  |
Provisions for impairment | $ | $ 105,000 |  |  |
Number of impaired properties held for investment | 38 |  |  |
COVID-19 impacted properties | Theaters |  |  |  |
Provisions for Impairment |  |  |  |
Provisions for impairment | $ | $ 83,800 |  |  |
Number of impaired properties held for investment | 13 |  |  |
Value of properties | $ | $ 39,600 |  |  | $ 123,400
Other properties |  |  |  |
Provisions for Impairment |  |  |  |
Provisions for impairment | $ | $ 42,200 |  |  |

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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