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Combined Guarantor Subsidiaries - Noncash Investing and Financing Activities - Summary (Details) - USD ($) | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Real Estate Investments, Net [Abstract] |  |
Additions to real estate assets accrued but not yet paid | $ 14,130,000 | $ 26,572,000
Increase (decrease) in lease liabilities arising from right-of-use assets | (159,000) | 4,042,000
Transfer of real estate assets in settlement of mortgage debt obligation: |  |
Decrease in real estate assets |  | (60,059,000)
Decrease in mortgage and other indebtedness |  | 124,111,000
Guarantor Subsidiaries |  |
Real Estate Investments, Net [Abstract] |  |
Additions to real estate assets accrued but not yet paid | 7,460,000 | 10,423,000
Distribution of properties to owners |  | 11,455,000
Increase (decrease) in lease liabilities arising from right-of-use assets | $ (20,000) | 489,000
Transfer of real estate assets in settlement of mortgage debt obligation: |  |
Decrease in real estate assets |  | (60,058,000)
Decrease in mortgage and other indebtedness |  | 115,271,000
Decrease in operating assets and liabilities |  | 8,246,000
Decrease in intangible lease and other assets |  | $ (1,663,000)

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- Definition Distributions of Properties to Owners + References No definition available. + Details
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- Definition SEC Schedule, 12-29, Real Estate Companies, Decrease in Intangible Lease and Other Assets + References No definition available. + Details
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- Definition Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from foreclosure. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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- Definition Amount of increase (decrease) before accumulated depreciation 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/2009/role/commonPracticeRef -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=120402810&loc=d3e638233-123024 + Details
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