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Indebtedness, net - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 21, 2023
USD ($)
Jun. 09, 2023
Jun. 13, 2018
extension
Jun. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]                  
Amount of capitalized principal that was amortized         $ 1,700,000 $ 6,600,000 $ 3,800,000 $ 11,400,000  
Repayments of long-term debt             342,935,000 $ 49,326,000  
Debt Balance         3,629,926,000   3,629,926,000   $ 3,835,272,000
Indebtedness, net ($38,730 and $0 attributable to VIEs)         3,631,719,000   3,631,719,000   $ 3,838,543,000
Interest costs capitalized         1,000,000   1,600,000    
Accumulated capitalized interest costs         7,000,000   7,000,000    
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    
Indebtedness, net ($38,730 and $0 attributable to VIEs)         122,800,000   122,800,000    
KEYS Pool B Loan | Mortgages                  
Debt Instrument [Line Items]                  
Debt Balance         174,400,000   174,400,000    
Indebtedness, net ($38,730 and $0 attributable to VIEs)         115,100,000   115,100,000    
KEYS Pool F Loan | Mortgages                  
Debt Instrument [Line Items]                  
Debt Balance         215,100,000   215,100,000    
Indebtedness, net ($38,730 and $0 attributable to VIEs)         $ 157,600,000   $ 157,600,000    
Mortgage Loan, Aggregate Principal Amount Above Mortgage Debt Threshold Amount | Mortgages                  
Debt Instrument [Line Items]                  
Debt Balance $ 415,000,000