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Reportable Segments - Reconciliation of NOI from Rental Real Estate Specific to Continuing Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Rental income | $ 2,463,997 | $ 2,571,705 | $ 2,700,691
Property and maintenance expense | (453,532) | (440,998) | (446,845)
Real estate taxes and insurance expense | (397,105) | (381,562) | (366,139)
Operating income | 1,675,841 | 1,317,990 | 1,356,160
Same Store, Non-same Store and Other |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Rental income | 2,463,997 | 2,571,705 | 2,700,691
Property and maintenance expense | (453,532) | (440,998) | (446,845)
Real estate taxes and insurance expense | (397,105) | (381,562) | (366,139)
Total operating expenses | (850,637) | (822,560) | (812,984)
Operating income | $ 1,613,360 | $ 1,749,145 | $ 1,887,707

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- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123420820&loc=SL77919311-209978 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=124502072&loc=SL77927221-108306 + Details
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