Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 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	$ 7,500
Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost	892	$ 1,611
Interest cost	4,606	3,722
Expected return on plan assets	(5,723)	(7,142)
Amortization of actuarial gain	0	110
Net periodic benefit cost	(225)	(1,699)
SERP [Member]
Components of net periodic benefit cost [Abstract]
Service cost	0	0
Interest cost	11	7
Expected return on plan assets	0	0
Amortization of actuarial gain	6	7
Net periodic benefit cost	$ 17	14
Other Postretirement Benefits Plan [Member]
Retirement Plans [Abstract]
Pension plan defined benefit plan cost increase limit percentage	4.00%
Components of net periodic benefit cost [Abstract]
Interest cost	$ 6	4
Amortization of actuarial gain	(86)	(98)
Net periodic benefit cost	$ (80)	$ (94)