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Combined Guarantor Subsidiaries - Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements Captions [Line Items]      
Amortization of intangible assets $ 4,506,000 $ 13,282,000 $ 13,256,000
Future amortization expense, 2020 1,848,000    
Future amortization expense, 2021 1,256,000    
Future amortization expense, 2022 1,003,000    
Future amortization expense, 2023 804,000    
Future amortization expense, 2024 786,000    
Interest expense capitalized 2,504,000 3,225,000 2,314,000
Restricted cash related to mortgage escrows [1] 26,062,000 28,562,000 34,625,000
Provision for doubtful accounts 3,463,000 4,817,000 3,782,000
Unamortized deferred financing costs 16,148,000 15,963,000  
Amortization expense 7,000,000 6,120,000 5,918,000
Accumulated amortization of deferred financing costs $ 17,175,000 22,098,000  
Customer Concentration Risk      
Condensed Financial Statements Captions [Line Items]      
Concentration risk (as a percent) 4.50%    
Certain Improvements | Minimum      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 10 years    
Certain Improvements | Maximum      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 20 years    
Guarantor Subsidiaries      
Condensed Financial Statements Captions [Line Items]      
Amortization of intangible assets $ 2,346,000 2,394,000 4,622,000
Future amortization expense, 2020 1,595,000    
Future amortization expense, 2021 1,204,000    
Future amortization expense, 2022 984,000    
Future amortization expense, 2023 672,000    
Future amortization expense, 2024 612,000    
Interest expense capitalized 505,000 705,000 598,000
Restricted cash related to mortgage escrows 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
Unamortized deferred financing costs 112,000 361,000  
Amortization expense 249,000 264,000 $ 399,000
Accumulated amortization of deferred financing costs 1,340,000 $ 1,092,000  
Income tax provision $ 0    
Guarantor Subsidiaries | Customer Concentration Risk | Sales Revenue, Net      
Condensed Financial Statements Captions [Line Items]      
Concentration risk (as a percent) 10.00%    
Guarantor Subsidiaries | ASC 842      
Condensed Financial Statements Captions [Line Items]      
Provision for doubtful accounts $ 2,072,000    
Guarantor Subsidiaries | Building      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 40 years    
Guarantor Subsidiaries | Certain Improvements | Minimum      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 10 years    
Guarantor Subsidiaries | Certain Improvements | Maximum      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 20 years    
Guarantor Subsidiaries | Equipment and Fixtures | Minimum      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 7 years    
Guarantor Subsidiaries | Equipment and Fixtures | Maximum      
Condensed Financial Statements Captions [Line Items]      
Useful life of property, plant and equipment 10 years    
[1]

 

(1)

Included in intangible lease assets and other assets in the consolidated balance sheets