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Employee Benefit Plans Unrecognized loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ (385,476)    
Unrecognized gains arising in current year 4,777 $ 644 $ 7,144
Ending Balance (312,280) (385,476)  
Unrecognized Pension and Postretirement Plan Income (Costs)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (7,469) (8,213) (16,513)
Ending Balance (2,635) (7,469) (8,213)
Pension Plans | Unrecognized Net Loss       
Before tax      
Beginning balance 12,070 13,558  
Reclass adjustment for postretirement plan gain included in net income (631) (653)  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax (6,119) (835)  
Ending balance 5,320 12,070 13,558
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance 9,384 10,545  
Recognized component of periodic pension cost (492) (510)  
Unrecognized gains arising in current year (4,775) (651)  
Ending Balance 4,117 9,384 10,545
Other Postretirement Benefit Plans | Unrecognized Prior Service Cost      
Before tax      
Beginning balance (2,084) (2,548)  
Reclass adjustment for postretirement plan gain included in net income 464 464  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 0 0  
Ending balance (1,620) (2,084) (2,548)
Other Postretirement Benefit Plans | Unrecognized Net Loss       
Before tax      
Beginning balance (818) (729)  
Reclass adjustment for postretirement plan gain included in net income 94 61  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax (23) (150)  
Ending balance (747) (818) (729)
Other Postretirement Benefit Plans | Unrecognized Pension and Postretirement Plan Income (Costs)      
Before tax      
Beginning balance (2,902) (3,277)  
Reclass adjustment for postretirement plan gain included in net income 558 525  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax (23) (150)  
Ending balance (2,367) (2,902) (3,277)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (2,264) (2,556)  
Recognized component of periodic pension cost 435 410  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Prior to Curtailment, Net of Tax   (118)  
Unrecognized gains arising in current year (18)    
Ending Balance $ (1,847) $ (2,264) $ (2,556)