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Schedule III - Real Estate and Accumulated Depreciation - Summary of Changes in Real Estate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Changes in total real estate |  |  |
Balance, beginning of year | $ 26,511,022 | $ 26,026,896 | $ 25,386,425
Acquisitions and development | 1,704,320 | 855,254 | 710,960
Improvements | 180,944 | 192,661 | 204,113
Dispositions and other | (862,679) | (563,789) | (274,602)
Balance, end of year | $ 27,533,607 | $ 26,511,022 | $ 26,026,896

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- Definition Gross amount at which new acquisitions and development properties are carried at the end of the period. + References No definition available. + Details
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- Definition Gross amount at which dispositions are removed from the balance sheet for properties sold during the year. + References No definition available. + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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