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Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Retirement Plans [Abstract]          
Service period of participants not impacted by pension plan amendment       15 years  
Age of plan participants not impacted by pension plan amendment       50 years  
Service period of participants who are age fifty not impacted by pension plan amendment       10 years  
Higman [Member]          
Retirement Plans [Abstract]          
Pension contributions       $ 1,400  
Higman [Member] | Scenario Forecast [Member]          
Retirement Plans [Abstract]          
Pension contributions     $ 300    
Pension Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Service cost $ 850 $ 924   2,547 $ 2,772
Interest cost 4,294 4,589   12,884 13,767
Expected return on plan assets (6,221) (5,727)   (18,663) (17,182)
Amortization of actuarial (gain) loss (584) 0   (1,748) 0
Net periodic benefit cost (1,661) (214)   (4,980) (643)
SERP [Member]          
Components of net periodic benefit cost [Abstract]          
Service cost 0 0   0 0
Interest cost 10 11   29 32
Expected return on plan assets 0 0   0 0
Amortization of actuarial (gain) loss 8 6   24 18
Net periodic benefit cost 18 17   53 50
Other Postretirement Benefits Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Interest cost 5 6   15 17
Amortization of actuarial (gain) loss (70) (86)   (210) (258)
Net periodic benefit cost $ (65) $ (80)   $ (195) $ (241)