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Combined Guarantor Subsidiaries - Noncash Investing and Financing Activities - Summary (Details) - USD ($)
 6 Months Ended
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)