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Debt - Narrative (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 22, 2021
USD ($)
tranche
extension
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 21, 2018
USD ($)
Debt Instrument [Line Items]              
Debt, net     $ 555,109,000   $ 502,151,000 $ 555,109,000  
Number of tranches | tranche 2            
Revolving line of credit              
Debt Instrument [Line Items]              
Repayments of lines of credit   $ 50,000,000 100,000,000        
Mortgages payable              
Debt Instrument [Line Items]              
Long-term debt, net     106,728,000   105,868,000 106,728,000  
Revolving line of credit              
Debt Instrument [Line Items]              
Outstanding borrowings     300,000,000   350,000,000 300,000,000  
Revolving line of credit | Revolving line of credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 350,000,000           $ 350,000,000
Long-term line of credit     $ 50,000,000   $ 0 $ 50,000,000  
Unused commitment fee (percent)         0.15% 0.15%  
Proceeds from lines of credit       $ 150,000,000      
Debt instrument, term 4 years            
Number of extension options | extension 2            
Extension option on line of credit, period 6 months            
Revolving line of credit | Revolving line of credit | One-month LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate (percent)       1.05%      
Unsecured Debt | Term loans              
Debt Instrument [Line Items]              
Long-term debt, net         $ 396,283,000    
Debt instrument, face amount $ 400,000,000            
Unsecured Debt | Term Loan, Tranche One              
Debt Instrument [Line Items]              
Debt instrument, term 5 years            
Debt instrument, face amount $ 200,000,000            
Unsecured Debt | Term Loan, Tranche Two              
Debt Instrument [Line Items]              
Debt instrument, term 5 years 6 months            
Debt instrument, face amount $ 200,000,000