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Schedule III - Real Estate And Accumulated Depreciation Property 4 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Development in Process | $ 4,975 | $ 1,316 |
SEC Schedule III, Real Estate, Federal Income Tax Basis | 2,814,722 |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |
Balance at beginning of period | 2,180,252 | 2,259,631 | $ 3,800,865
Acquisitions and capital improvements | 598,843 | 497,646 | 484,776
Disposals and write-offs | (263,010) | (534,458) | (220,052)
Properties classified as discontinued operations | 0 | (42,567) | (1,805,958)
Balance at end of period | 2,516,085 | 2,180,252 | 2,259,631
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Balance at beginning of period | 351,389 | 394,904 | 598,440
Depreciation expense, continuing operations | 70,959 | 63,684 | 66,860
Depreciation expense, properties classified as discontinued operations | 974 | 27,397 | 66,840
Disposal Group, SEC Schedule III, Real Estate, Accumulated Depreciation | 0 | (2,601) | (272,294)
SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold | (74,985) | (131,995) | (64,942)
Balance at end of period | $ 348,337 | $ 351,389 | $ 394,904
Building and improvements [Member] |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Estimated lives used to compute depreciation | 30 years |  |
Furniture, fixtures & equipment [Member] | Minimum [Member] |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Estimated lives used to compute depreciation | 5 years |  |
Furniture, fixtures & equipment [Member] | Maximum [Member] |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |
Estimated lives used to compute depreciation | 15 years |  |

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- Definition Amount of depreciation expense pertaining to real estate investments held for sale for entities with a substantial portion of business acquiring and holding investment real estate. + References No definition available. + Details
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- Definition Amount, before accumulated depreciation, of real estate investments held for sale for entities with a substantial portion of business acquiring and holding investment real estate. + References No definition available. + Details
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- Definition SEC Schedule III, Real Estate, Acquisitions and Capital Improvements + References No definition available. + Details
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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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/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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