Quarterly report [Sections 13 or 15(d)]

Debt - Narrative (Details)

v3.25.3
Debt - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Aug. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Aug. 31, 2025
Jul. 31, 2025
Sep. 19, 2024
Feb. 28, 2022
Debt Instrument [Line Items]                
Draw down on revolving credit facility   $ 1,114,872 $ 850,000          
Subject to mandatory redemption, period   15 years            
Accrued return paid   $ 249 2,047          
Subsidiary Units Subject to Mandatory Redemption                
Debt Instrument [Line Items]                
Accrued interest   100   $ 100        
Historical costs of units cost and fair value of units   $ 3,300            
Implicit rate   9.80%            
Credit Agreement | Medium-Term Note | Secured Debt                
Debt Instrument [Line Items]                
Original principal $ 1,650,000              
Debt face amount     $ 1,700,000          
Interest rate   2.00%   2.25% 2.00% 2.25%    
Principal outstanding   $ 1,687,300   $ 1,700,000        
Accrued interest   300   300        
Unamortized deferred issuance costs   24,700   27,800        
Credit Agreement | Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Accrued interest   300            
Borrowing capacity   1,400,000   1,400,000        
Deferred issuance cost   8,000   9,600        
Commitments available to be borrowed   1,274,600   1,399,700        
Draw down on revolving credit facility   125,400            
Reduction on revolving credit facility from undrawn letter of credit       300        
Unpaid commitment fees   $ 800   1,200        
Credit Agreement | Line of Credit | Revolving Credit Facility | Minimum                
Debt Instrument [Line Items]                
Commitment fee on undrawn amounts   0.25%            
Credit Agreement | Line of Credit | Revolving Credit Facility | Maximum                
Debt Instrument [Line Items]                
Commitment fee on undrawn amounts   0.50%            
Senior Secured Notes Due February 2030 | Senior Secured Notes                
Debt Instrument [Line Items]                
Debt face amount               $ 400,000
Interest rate   4.38%            
Accrued interest   $ 2,900   7,300        
Unamortized deferred issuance costs   $ 4,900   5,600        
Senior Secured Notes Due August 2032 | Senior Secured Notes                
Debt Instrument [Line Items]                
Debt face amount       600,000     $ 600,000  
Interest rate   5.88%            
Accrued interest   $ 11,800   $ 20,000        
Debt instrument, face amount, percentage       99.50%        
Unamortized discounts and debt issuance costs, including discount   $ 20,100   $ 21,800