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Short-Term and Long-Term Borrowings - Narrative (Details) - USD ($)
 12 Months Ended
Mar. 28, 2024
Dec. 31, 2024
Dec. 11, 2024
Dec. 31, 2023
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 390,000,000    
Debt, weighted average interest rate (as a percent)   5.61%   6.70%
Long-term debt   $ 943,734,000   $ 824,059,000
Long-term debt   $ 947,000,000   827,000,000
Debt instrument, redemption price, percentage of principal amount redeemed (as a percent) 10.00%      
Debt instrument, redemption price (as a percent) 100.00% 100.00%    
Senior Notes        
Debt Instrument [Line Items]        
Long-term debt $ 120,000,000.0      
Minimum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate (as a percent)   0.00%    
Debt to total capitalization ratio   0.60    
Interest and dividend coverage ratio   1.50    
Maximum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate (as a percent)   2.00%    
Debt to total capitalization ratio   0.65    
OTC Credit Agreement        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 170,000,000    
Line of credit facility, increased current borrowing capacity, accordion provision     $ 290,000,000  
OTP Credit Agreement        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   220,000,000    
Line of credit facility, increased current borrowing capacity, accordion provision     300,000,000  
Series 2024A Senior Unsecured Notes        
Debt Instrument [Line Items]        
Long-term debt   $ 60,000,000   0
Interest rate (as a percent)   5.48%    
Series 2024A Senior Unsecured Notes | Senior Notes        
Debt Instrument [Line Items]        
Long-term debt $ 60,000,000.0      
Interest rate (as a percent) 5.48%      
Series 2024B Senior Unsecured Notes        
Debt Instrument [Line Items]        
Long-term debt   $ 60,000,000   $ 0
Interest rate (as a percent)   5.77%    
Series 2024B Senior Unsecured Notes | Senior Notes        
Debt Instrument [Line Items]        
Long-term debt $ 60,000,000.0      
Interest rate (as a percent) 5.77%      
Revolving Credit Facility | OTC Credit Agreement        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     170,000,000  
Revolving Credit Facility | OTP Credit Agreement        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     220,000,000  
Letter of Credit | OTC Credit Agreement        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     40,000,000  
Letter of Credit | OTP Credit Agreement        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 50,000,000