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Combined Guarantor Subsidiaries - Noncash Investing and Financing Activities - Summary (Details) - 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 $ 24,642,000 $ 22,791,000 $ 5,490,000
Lease liabilities arising from obtaining right-of-use assets 3,837,000 4,074,000  
Transfer of real estate assets in settlement of mortgage debt obligation:      
Decrease in real estate assets (60,059,000)   (149,722,000)
Decrease in mortgage and other indebtedness 124,111,000   181,992,000
Guarantor Subsidiaries      
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)