Quarterly report pursuant to Section 13 or 15(d)

Indebtedness - Former Credit Facility (Details)

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Indebtedness - Former Credit Facility (Details) - USD ($)
1 Months Ended 6 Months Ended
Dec. 31, 2021
Sep. 30, 2017
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Apr. 30, 2020
Line of Credit Facility [Line Items]            
Proceeds from credit facility     $ 0 $ 45,000,000    
Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Term (in years)   5 years        
Credit facility amount $ 525,000,000 $ 150,000,000       $ 250,000,000
Aggregate principal amount 450,000,000         225,000,000
Additional borrowing capacity of credit facility 75,000,000         $ 25,000,000
Borrowings outstanding 300,000,000   0      
Repayments of debt 150,000,000          
Revolving Credit Facility | Medium-term Notes            
Line of Credit Facility [Line Items]            
Borrowings outstanding 150,000,000          
Proceeds from credit facility $ 150,000,000          
Letter of Credit            
Line of Credit Facility [Line Items]            
Credit facility amount   30,000,000        
Outstanding amount     $ 19,769,000   $ 19,769,000  
Swing Line Loan            
Line of Credit Facility [Line Items]            
Credit facility amount   $ 30,000,000