Retirement Plans (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
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				$ 500
Higman [Member] | Subsequent Event [Member]
Retirement Plans [Abstract]
Pension contributions	$ 200
Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost		$ 1,658	$ 2,053	3,269	$ 3,980
Interest cost		3,640	3,535	7,362	7,119
Expected return on plan assets		7,154	6,559	(14,296)	(13,133)
Amortization of actuarial loss (gain)		(132)	(790)	242	1,888
Net periodic benefit cost		(1,724)	(181)	3,423	146
SERP [Member]
Components of net periodic benefit cost [Abstract]
Service cost				0	0
Interest cost		8	7	15	15
Expected return on plan assets				0	0
Amortization of actuarial loss (gain)		(8)	(10)	15	20
Net periodic benefit cost		16	17	$ 30	35
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		4	4	$ 8	8
Amortization of actuarial loss (gain)		99	112	197	225
Net periodic benefit cost		$ (95)	$ (108)	$ (189)	$ (217)