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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract] |  |  |
Total cost basis for federal income tax purposes | $ 4,600,000 |  |
Reconciliation of real estate owned: |  |  |
Balance at the beginning of year | 3,671,560 | $ 3,812,294 | $ 3,564,466
Additions during year | 478,717 | 210,143 | 492,437
Properties sold during year | (332,670) | (282,143) | (212,771)
Properties impaired during the year | (11,306) | (65,426) | (31,741)
Other reclassifications | (16,590) | (3,308) | (97)
Balance at end of year | 3,789,711 | 3,671,560 | 3,812,294
Reconciliation of accumulated depreciation and amortization: |  |  |
Balance at the beginning of year | 795,486 | 775,617 | 738,068
Depreciation and amortization expense | 124,618 | 119,156 | 122,057
Accumulated depreciation and amortization of properties sold, impaired and held for sale during year | (106,268) | (98,698) | (84,508)
Other reclassifications | (1,629) | (589) | 0
Balance at end of year | $ 812,207 | $ 795,486 | $ 775,617

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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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