Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Components of net periodic benefit cost [Abstract]
Contribution made to pension and postretirement plans	$ 0
Pension Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost	0	$ 11
Interest cost	223	216
Expected return on plan assets	(817)	(761)
Amortization of net gain	0	0
Amortization of prior service credit	0	0
Net periodic benefit	(594)	(534)
Other Postretirement Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost	18	22
Interest cost	52	44
Expected return on plan assets	(333)	(327)
Amortization of net gain	(78)	(228)
Amortization of prior service credit	(280)	(52)
Net periodic benefit	$ (621)	$ (541)