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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Summary (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract] |  |  |
Total cost basis for federal income tax purposes | $ 4,000,000 |  |
Reconciliation of real estate owned: |  |  |
Balance at the beginning of year | 3,320,574 | $ 3,090,134 | $ 3,936,459
Additions during year | 580,861 | 663,742 | 310,207
Properties sold and impaired during the year | (354,218) | (496,730) | (1,091,956)
Other reclassifications | (32,653) | 63,428 | (64,576)
Balance at end of year | 3,514,564 | 3,320,574 | 3,090,134
Reconciliation of accumulated depreciation and amortization: |  |  |
Balance at the beginning of year | 675,596 | 722,644 | 890,969
Depreciation and amortization expense | 127,504 | 118,525 | 136,571
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year | (102,261) | (177,709) | (290,938)
Other reclassifications | (16,371) | 12,136 | (13,958)
Balance at end of year | $ 684,468 | $ 675,596 | $ 722,644

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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 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 of other deductions to accumulated depreciation, excluding sales, 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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