Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year					$ 250
Post-Retirement Health Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year					$ 248
Service cost	$ 9	$ 11	$ 17	$ 22
Interest cost	27	25	55	51
Expected return on plan assets	0	0	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Net amortization of net (gain) loss	0	0	0	0
Net Periodic Benefit Cost	36	36	72	73
Defined Benefit Plan, Plan Assets, Contributions by Employer			116
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	298	338	595	677
Interest cost	707	658	1,413	1,316
Expected return on plan assets	(1,228)	(1,179)	(2,455)	(2,357)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Net amortization of net (gain) loss	314	518	629	1,036
Net Periodic Benefit Cost	$ 91	$ 335	182	$ 672
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 63