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Short-Term and Long-Term Borrowings - Lines of Credit (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Line of Credit Facility [Line Items]    
Borrowing Limit $ 340,000,000  
Amount Outstanding 0 $ 81,422,000
Letters of Credit 9,132,000  
Amount Available 330,868,000 249,446,000
OTC Credit Agreement    
Line of Credit Facility [Line Items]    
Borrowing Limit 170,000,000  
Amount Outstanding 0  
Letters of Credit 0  
Amount Available 170,000,000 170,000,000
OTP Credit Agreement    
Line of Credit Facility [Line Items]    
Borrowing Limit 170,000,000  
Amount Outstanding 0  
Letters of Credit 9,132,000  
Amount Available $ 160,868,000 $ 79,446,000