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Indebtedness, net - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 21, 2023
USD ($)
Jun. 09, 2023
Jun. 13, 2018
extension
Jun. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]                  
Amount of capitalized principal that was amortized         $ 1,800,000 $ 4,900,000 $ 3,800,000 $ 7,600,000  
Repayments of long-term debt             257,473,000 $ 11,877,000  
Debt Balance       $ 3,713,312,000 3,713,312,000   3,713,312,000   $ 3,835,272,000
Indebtedness, net ($35,808 and $0 attributable to VIEs)       3,715,902,000 3,715,902,000   3,715,902,000   3,838,543,000
Interest costs capitalized         566,000   566,000    
Accumulated capitalized interest costs       6,000,000 6,000,000   6,000,000    
Mortgages                  
Debt Instrument [Line Items]                  
Debt Balance       3,676,697,000 3,676,697,000   3,676,697,000   3,835,272,000
Indebtedness, net ($35,808 and $0 attributable to VIEs)       3,715,902,000 3,715,902,000   3,715,902,000   $ 3,838,543,000
Credit Agreement                  
Debt Instrument [Line Items]                  
Cash exit fee (as a percent) 50.00%                
Credit Agreement | Line of Credit                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 100,000,000                
Unused capacity, commitment fee (as a percent) 9.00%                
Initial term period (in years) 12 months                
Credit Agreement | Mortgages                  
Debt Instrument [Line Items]                  
Mortgage debt threshold amount $ 400,000,000                
KEYS Mortgage Loans | Mortgages                  
Debt Instrument [Line Items]                  
Initial term period (in years)     2 years            
Number of extension options | extension     5            
Term of extension option (in years)   30 days 1 year            
KEYS Pool C Loan | Mortgages                  
Debt Instrument [Line Items]                  
Repayments of long-term debt       62,400,000          
KEYS Pool D Loan | Mortgages                  
Debt Instrument [Line Items]                  
Repayments of long-term debt       25,600,000          
KEYS Pool E Loan | Mortgages                  
Debt Instrument [Line Items]                  
Repayments of long-term debt       41,000,000          
KEYS Pool A Loan | Mortgages                  
Debt Instrument [Line Items]                  
Debt Balance       180,700,000 180,700,000   180,700,000    
Indebtedness, net ($35,808 and $0 attributable to VIEs)       124,100,000 124,100,000   124,100,000    
KEYS Pool B Loan | Mortgages                  
Debt Instrument [Line Items]                  
Debt Balance       174,400,000 174,400,000   174,400,000    
Indebtedness, net ($35,808 and $0 attributable to VIEs)       116,000,000 116,000,000   116,000,000    
KEYS Pool F Loan | Mortgages                  
Debt Instrument [Line Items]                  
Debt Balance       215,100,000 215,100,000   215,100,000    
Indebtedness, net ($35,808 and $0 attributable to VIEs)       $ 160,200,000 $ 160,200,000   $ 160,200,000    
Mortgage Loan, Aggregate Principal Amount Above Mortgage Debt Threshold Amount | Mortgages                  
Debt Instrument [Line Items]                  
Debt Balance $ 415,000,000