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Schedule III Real Estate and Accumulated Depreciation [Schedule] (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Real estate investments: |  |  |
Balance at beginning of year | $ 13,656,807 | $ 13,292,039 | $ 12,972,170
Acquisitions | 105,730 | 130,187 | 127,710
Less: FMV of leases included in acquisitions | (512) | (796) | (1,488)
Improvement and development | 302,380 | 253,954 | 322,829
Disposition of real estate assets | (165,698) | (18,577) | (123,861)
Balance at end of year | 13,898,707 | 13,656,807 | 13,292,039
Accumulated depreciation: |  |  |
Balance at beginning of year | 2,549,287 | 2,075,071 | 1,674,801
Depreciation | 493,674 | 485,654 | 463,590
Disposition of real estate assets | (87,708) | (11,438) | (63,320)
Balance at end of year | $ 2,955,253 | $ 2,549,287 | 2,075,071
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |
Real estate investments: |  |  |
Balance at beginning of year |  |  | $ 5,321

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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- Definition Amount of decrease to accumulated depreciation for 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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