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Schedule III - Real Estate and Accumulated Depreciation (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Federal income tax purposes | $ 1,700,000 |  |
Real Estate: |  |  |
Beginning balance | 2,679,737 | $ 2,643,065 | $ 2,501,844
Additions to/improvements of real estate | 63,795 | 57,611 | 153,163
Assets sold/written-off | (27,603) | (20,939) | (11,942)
Ending balance | 2,715,929 | 2,679,737 | 2,643,065
Accumulated Depreciation |  |  |
Beginning balance | 616,175 | 558,657 | 492,582
Depreciation expense | 73,659 | 72,191 | 70,592
Assets sold/written-off | (12,809) | (14,673) | (4,517)
Ending balance | $ 677,025 | $ 616,175 | $ 558,657
Land improvements |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Useful life | 7 years |  |
Building |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Useful life | 50 years |  |
Buildings and improvements | Minimum |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Useful life | 7 years |  |
Buildings and improvements | Maximum |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Useful life | 15 years |  |
Leasehold improvements |  |  |
Real Estate And Accumulated Depreciation [Line Items] |  |  |
Useful life | 15 years |  |

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- Definition Cost basis of real estate investments for federal income tax purposes 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 6 -Subsection 28 Reference 2: 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 6)) -URI http://asc.fasb.org/extlink&oid=120402810&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=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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