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Schedule III - Real Estate and Accumulated Depreciation (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes in cost of properties |  |  |
Beginning balance | $ 3,980,813 | $ 3,874,715 | $ 4,158,616
Improvements and other additions | 224,524 | 259,548 | 251,960
Sales | (53,547) | (138,216) | (268,038)
Impairments | (2,493) | (15,116) | (143,502)
Other dispositions | (768) | (118) | (124,321)
Ending balance | 4,148,529 | 3,980,813 | 3,874,715
Changes in accumulated depreciation |  |  |
Beginning balance | 801,038 | 715,951 | 718,680
Depreciation expense | 112,610 | 107,772 | 105,763
Sales | (14,845) | (22,567) | (56,607)
Impairments | (132) | 0 | (42,161)
Other dispositions | (768) | (118) | (9,724)
Ending balance | $ 897,903 | $ 801,038 | $ 715,951

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- Definition Represents the amount of impairment charged 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=6590653&loc=d3e638233-123024 + 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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