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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Total cost basis for federal income tax purposes | $ 3,800,000 |  |
Reconciliation of real estate owned: |  |  |
Balance at the beginning of year | 3,936,459 | $ 3,533,172 | $ 3,789,711
Additions during year | 310,207 | 676,355 | 291,004
Properties sold and impaired during the year | (1,091,956) | (270,241) | (527,597)
Other reclassifications | (64,576) | (2,827) | (19,946)
Balance at end of year | 3,090,134 | 3,936,459 | 3,533,172
Reconciliation of accumulated depreciation and amortization: |  |  |
Balance at the beginning of year | 890,969 | 844,931 | 812,207
Depreciation and amortization expense | 136,571 | 139,493 | 128,384
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year | (290,938) | (93,455) | (86,428)
Other reclassifications | (13,958) | 0 | (9,232)
Balance at end of year | $ 722,644 | $ 890,969 | $ 844,931

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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=6590653&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=6590653&loc=d3e638233-123024 + Details
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