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Corporate Borrowings - Narrative (Details) - USD ($)
$ in Thousands
Nov. 16, 2021
Sep. 30, 2025
Apr. 24, 2025
Dec. 31, 2024
Aug. 23, 2023
Aug. 22, 2023
Feb. 14, 2020
Dec. 31, 2019
Dec. 31, 2017
Debt Instrument [Line Items]                  
Total indebtedness outstanding   $ 276,650   $ 329,450          
Convertible Senior Notes, 1.88% (fixed rate) due 2041 | Convertible Debt                  
Debt Instrument [Line Items]                  
Total indebtedness outstanding   $ 201,250   201,250          
Proceeds from issuance of debt $ 201,250                
Stated interest rate 1.88% 1.88%              
Note Purchase Agreement | Secured Debt                  
Debt Instrument [Line Items]                  
Maximum face amount of notes         $ 250,000        
Remaining face amount of notes   $ 231,600              
Series A Senior Secured Notes | Secured Debt                  
Debt Instrument [Line Items]                  
Maximum face amount of notes           $ 20,000      
Series A Senior Secured Notes, 3.53% (fixed rate) due 2027 | Secured Debt                  
Debt Instrument [Line Items]                  
Total indebtedness outstanding   $ 6,400   8,800          
Stated interest rate   3.53%              
Face amount of notes                 $ 20,000
Senior Secured Notes | Secured Debt                  
Debt Instrument [Line Items]                  
Maximum face amount of notes           $ 105,000      
Senior Secured Notes, 3.80% (fixed rate) due 2029 | Secured Debt                  
Debt Instrument [Line Items]                  
Total indebtedness outstanding   $ 12,000   14,400          
Stated interest rate   3.80%              
Face amount of notes               $ 20,000  
Revolving Credit Facility | Credit Agreement - Revolver, 5.26% (variable rate) due 2030 | Line of Credit                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity     $ 500,000       $ 300,000    
Contingent increase in borrowing capacity     200,000            
Loan fees     $ 2,712            
Total indebtedness outstanding   $ 57,000   $ 105,000          
Remaining borrowing capacity   $ 443,000