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Schedule III: Real Estate and Accumulated Depreciation - Summary of Activity for Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Continuing Operations |  |  |
Real estate: |  |  |
Balances at beginning of year | $ 10,372,584 | $ 9,707,488 | $ 9,460,973
Acquisition of real estate and development and improvements | 3,460,556 | 1,621,739 | 1,047,312
Sales and/or transfers to assets held for sale | (203,687) | (852,480) | (386,770)
Deconsolidation of real estate | 0 | 0 | (325,580)
Impairments | (23,991) | (19,067) | (5,609)
Other | (76,569) | (85,096) | (82,838)
Balances at end of year | 13,528,893 | 10,372,584 | 9,707,488
Accumulated depreciation: |  |  |
Balances at beginning of year | 2,141,960 | 2,054,888 | 1,912,628
Depreciation expense | 438,735 | 365,319 | 340,600
Sales and/or transfers to assets held for sale | (93,220) | (190,877) | (82,139)
Real estate held for sale | 0 | 0 | (43,525)
Other | (78,340) | (87,370) | (72,676)
Balances at end of year | 2,409,135 | 2,141,960 | 2,054,888
Discontinued Operations |  |  |
Real estate: |  |  |
Balances at beginning of year | 4,133,349 | 3,440,706 | 4,257,599
Acquisition of real estate and development and improvements | 119,333 | 812,827 | 46,591
Sales and/or transfers to assets held for sale | (1,114,792) | (245,291) | (814,577)
Impairments | (198,048) | (200,546) | (44,120)
Other | (9,276) | 325,653 | (4,787)
Balances at end of year | 2,930,566 | 4,133,349 | 3,440,706
Accumulated depreciation: |  |  |
Balances at beginning of year | 861,557 | 817,931 | 863,602
Depreciation expense | 91,726 | 122,792 | 121,064
Sales and/or transfers to assets held for sale | (333,654) | (68,391) | (161,755)
Other | (3,921) | (10,775) | (4,980)
Balances at end of year | $ 615,708 | $ 861,557 | $ 817,931

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- Definition The total amount of real estate investments acquired through acquisition, the amount of real estate developed, and the improvements made to real estate investments during the period. + References No definition available. + Details
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- Definition Amount of accumulated depreciation pertaining 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(Column F)) -URI http://asc.fasb.org/extlink&oid=120402810&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=120402810&loc=d3e638233-123024 + Details
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