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Schedule III - Real Estate and Accumulated Depreciation - Accumulated Depreciation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Real Estate |  |  |
Balance at beginning of period | $ 2,671,854 | $ 2,138,500 | $ 2,084,642
Real estate before impairments and assets written-off | 2,806,757 | 2,704,668 | 2,152,859
Less: Impairments and assets sold or written-off | (37,765) | (32,814) | (14,359)
Balance at end of period | 2,768,992 | 2,671,854 | 2,138,500
Accumulated Depreciation |  |  |
Balance at beginning of period | 645,872 | 587,127 | 541,077
Additions charged to operating expenses | 80,578 | 65,140 | 42,989
Accumulated depreciation before depreciation of assets written-off | 667,705 | 606,217 | 552,101
Less: Accumulated depreciation on assets written-off | (21,833) | (19,090) | (11,024)
Balance at end of period | 587,127 | 541,077 | 509,112
Land |  |  |
Real Estate |  |  |
Additions during the period: | 4,120 | 142,305 | 2,667
Buildings & improvements |  |  |
Real Estate |  |  |
Additions during the period: | 12,394 | 389,338 | 18,316
Construction in progress |  |  |
Real Estate |  |  |
Additions during the period: | $ 118,389 | $ 34,525 | $ 47,234

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- Definition SEC Schedule III, Real Estate Accumulated Depreciation, Before Other Deductions + References No definition available. + Details
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- Definition SEC Schedule III, Real Estate, Gross, Before Write-Down Or Reserve, Amount + References No definition available. + 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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- 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=6590653&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + 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 E)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of increase in real estate investments from acquisitions other than through foreclosure 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=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of depreciation expense of 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(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of write-down or reserve recognized in the income statement on 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(Footnote 5)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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