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Combined Guarantor Subsidiaries - Summary of Significant Accounting Policies - Narrative (Details) - Guarantor Subsidiaries - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements Captions [Line Items]      
Amortization of intangible assets $ 2,346,000 $ 2,394,000 $ 4,622,000
Estimated total net amortization expense of intangible assets in 2020 1,595,000    
Estimated total net amortization expense of intangible assets in 2021 1,204,000    
Estimated total net amortization expense of intangible assets in 2022 984,000    
Estimated total net amortization expense of intangible assets in 2023 672,000    
Estimated total net amortization expense of intangible assets in 2024 612,000    
Interest expense capitalized 505,000 705,000 598,000
Restricted cash related to mortgage escrows [1] 4,134,000 3,413,000 6,065,000
Restricted cash related to mortgage escrows   7,139,000  
Provision for doubtful accounts 2,072,000 1,236,000 1,564,000
Net deferred financing costs 112,000 361,000  
Amortization expense related to deferred financing costs 249,000 264,000 $ 399,000
Accumulated amortization of deferred financing costs 1,340,000 $ 1,092,000  
Income tax provision $ 0    
Customer Concentration Risk | Sales Revenue, Net      
Condensed Financial Statements Captions [Line Items]      
Concentration risk (less than) 10.00%    
ASC 842      
Condensed Financial Statements Captions [Line Items]      
Provision for doubtful accounts $ 2,072,000    
Building      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 40 years    
Improvements | Minimum      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 10 years    
Improvements | Maximum      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 20 years    
Equipment and Fixtures | Minimum      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 7 years    
Equipment and Fixtures | Maximum      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 10 years    
[1] Included in intangible lease assets and other assets in the combined balance sheets.