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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Total cost basis for federal income tax purposes | $ 4,700,000 |  |
Reconciliation of real estate owned: |  |  |
Balance at the beginning of year | 3,533,172 | $ 3,789,711 | $ 3,671,560
Additions during year | 676,355 | 291,004 | 478,717
Properties sold and impaired during the year | (270,241) | (527,597) | (343,976)
Other reclassifications | (2,827) | (19,946) | (16,590)
Balance at end of year | 3,936,459 | 3,533,172 | 3,789,711
Reconciliation of accumulated depreciation and amortization: |  |  |
Balance at the beginning of year | 844,931 | 812,207 | 795,486
Depreciation and amortization expense | 139,493 | 128,384 | 124,618
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year | (93,455) | (86,428) | (106,268)
Other reclassifications | 0 | (9,232) | (1,629)
Balance at end of year | 890,969 | 844,931 | 812,207
LCIF [Member] |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Total cost basis for federal income tax purposes | 900,000 |  |
Reconciliation of real estate owned: |  |  |
Balance at the beginning of year | 731,202 | 1,061,606 | 910,113
Additions during year | 123,261 | 49,417 | 152,280
Properties sold and impaired during the year | (60,221) | (379,821) | (787)
Balance at end of year | 794,242 | 731,202 | 1,061,606
Reconciliation of accumulated depreciation and amortization: |  |  |
Balance at the beginning of year | 182,505 | 199,690 | 176,167
Depreciation and amortization expense | 30,701 | 26,989 | 23,523
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year | (34,830) | (44,174) | 0
Balance at end of year | $ 178,376 | $ 182,505 | $ 199,690

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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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- 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/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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