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Notes Payable - Unsecured Notes and Term Loans Outstanding (Details) - Unsecured notes and term loans - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Total principal $ 525,000,000 $ 500,000,000
Premiums and discounts, net (94,000) (116,000)
Deferred issuance costs, net (2,561,000) (2,525,000)
Total 522,345,000 497,359,000
Principal amounts due prior to maturity $ 0  
2018 Term Loan    
Debt Instrument [Line Items]    
Effective interest rate (percent) 2.31%  
Total principal $ 0 100,000,000
2018 Term Loan | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate (percent) 1.10%  
2023 Term Loan    
Debt Instrument [Line Items]    
Effective interest rate (percent) 4.73%  
Total principal $ 125,000,000 0
2023 Term Loan | Secured Overnight Financing Rate (SOFR)    
Debt Instrument [Line Items]    
Basis spread on variable rate (percent) 0.95%  
30 Year Unsecured Notes 7.25%    
Debt Instrument [Line Items]    
Coupon/Stated Rate 7.25%  
Effective interest rate (percent) 7.36%  
Total principal $ 50,000,000 50,000,000
Green Bonds    
Debt Instrument [Line Items]    
Coupon/Stated Rate 3.44%  
Effective interest rate (percent) 4.09%  
Total principal $ 350,000,000 $ 350,000,000