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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Rental income | $ 2,571,705 | $ 2,700,691 | $ 2,577,681
Property and maintenance expense | (440,998) | (446,845) | (429,335)
Real estate taxes and insurance expense | (381,562) | (366,139) | (357,814)
Operating income | 1,317,990 | 1,356,160 | 1,114,617
Same Store, Non-same Store and Other |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Rental income | 2,571,705 | 2,700,691 | 2,577,681
Property and maintenance expense | (440,998) | (446,845) | (429,335)
Real estate taxes and insurance expense | (381,562) | (366,139) | (357,814)
Total operating expenses | (822,560) | (812,984) | (787,149)
Operating income | $ 1,749,145 | $ 1,887,707 | $ 1,790,532

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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=120395209&loc=SL114868664-224227 + Details
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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121549951&loc=d3e39896-112707 + Details
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- Definition The aggregate total of real estate taxes and insurance expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35301-107843 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.6) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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