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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in cost of properties |  |  |
Beginning balance | $ 3,874,715 | $ 4,158,616 | $ 4,014,336
Acquisitions of operating properties | 0 | 0 | 194,616
Improvements and other additions | 259,548 | 251,960 | 273,761
Sales | (138,216) | (268,038) | (172,628)
Impairments | (15,116) | (143,502) | (29,548)
Other dispositions | (118) | (124,321) | (121,921)
Ending balance | 3,980,813 | 3,874,715 | 4,158,616
Changes in accumulated depreciation |  |  |
Beginning balance | 715,951 | 718,680 | 703,083
Depreciation expense | 107,772 | 105,763 | 112,695
Sales | (22,567) | (56,607) | (49,614)
Impairments | 0 | (42,161) | (6,092)
Other dispositions | (118) | (9,724) | (41,392)
Ending balance | $ 801,038 | $ 715,951 | $ 718,680

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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