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Retirement Plans (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
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       $ 7,700  
Higman [Member] | Subsequent Event [Member]          
Retirement Plans [Abstract]          
Pension contributions $ 400        
Pension Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Service cost   $ 956 $ 1,658 1,848 $ 3,269
Interest cost   4,572 3,640 9,178 7,362
Expected return on plan assets   (5,732) (7,154) (11,455) (14,296)
Amortization of actuarial loss   0 132 0 242
Net periodic benefit cost   (204) (1,724) 429 (3,423)
SERP [Member]          
Components of net periodic benefit cost [Abstract]          
Service cost   0 0 0 0
Interest cost   10 8 21 15
Expected return on plan assets   0 0 0 0
Amortization of actuarial loss   6 8 12 15
Net periodic benefit cost   16 16 33 30
Other Postretirement Benefits Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Interest cost   5 4 11 8
Amortization of actuarial loss   (86) (99) (172) (197)
Net periodic benefit cost   $ 81 $ (95) $ 161 $ (189)