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Combined Guarantor Subsidiaries - Noncash Investing and Financing Activities - Summary (Details) - Guarantor Subsidiaries - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate Investments, Net [Abstract]
Additions to real estate assets accrued but not yet paid	$ 8,198,000	$ 5,764,000	$ 9,777,000
Distribution of properties to owners	11,504,000	0
Lease liabilities arising from obtaining right-of-use assets	489,000	490,000
Transfer of real estate assets in settlement of mortgage debt obligation:
Decrease in real estate assets	(60,058,000)	0	(111,457,000)
Decrease in mortgage and other indebtedness	115,271,000	0	135,366,000
Decrease in operating assets and liabilities	8,246,000	0	8,215,000
Decrease in intangible lease and other assets	$ (1,663,000)	$ 0	$ (2,938,000)

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Future cash outflow to pay for real estate additions accrued but not yet paid.

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Distributions of Properties to Owners

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SEC Schedule, 12-29, Real Estate Companies, Decrease in Intangible Lease and Other Assets

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SEC Schedule, 12-29, Real Estate Companies, Decrease in Operating Assets and Liabilities

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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))
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Present value of lessee's discounted obligation for lease payments from operating lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
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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.

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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)
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