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Schedule III - Real Estate and Accumulated Depreciation - Changes in Real Estate Assets (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balance, beginning of period | $ 12,653,444,998 | $ 12,008,075,148 | $ 11,568,809,126
Acquisitions | 3,420,020 | 438,125,265 | 181,719,189
Improvements | 554,408,568 | 414,955,609 | 217,668,292
Transfers from unconsolidated joint ventures |  | 329,194,717 | 615,511,560
Change in exchange rate |  | 1,035,816 | 598,744
Sales | (767,246,512) | (315,954,464) | (391,758,149)
Transfers to unconsolidated joint ventures | (315,728,832) |  |
Assets held for sale | (69,741,938) | (56,187,719) | (12,608,829)
Adjustment for fully depreciated assets | (72,992,791) | (107,660,366) | (80,660,536)
Adjustment of property carrying values | (108,373,018) | (58,139,008) | (91,204,249)
Balance, end of period | $ 11,877,190,495 | $ 12,653,444,998 | $ 12,008,075,148

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- Definition Amount of increase (decrease) in real estate investments from changes in the exchange rate. + References No definition available. + Details
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- Definition The adjustment for fully depreciated assets. + References No definition available. + Details
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- Definition The adjustment on real estate for property carrying values. + References No definition available. + Details
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- Definition The amount of change in foreign exchange rates on real estate. + References No definition available. + Details
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- Definition Amount of transfers to unconsolidated joint ventures to real estate investments, excluding sales, for entities with a substantial portion of business acquiring and holding investment real estate. + References No definition available. + Details
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- Definition Amount of real estate investments sold 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 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 Amount of increase in real estate investments from acquisitions other than through foreclosure 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 Amount of other additions excluding acquisition or improvement to real estate investments 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 Amount of other deductions to real estate investments, excluding sales, 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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