Employee's Pension and Postretirement Benefits - Amounts Accrued and Unfunded Status (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Amounts Accrued
Obligation, beginning of period	$ 20,056	$ 20,116	$ 20,116
Interest cost	80	$ 100	72
Actuarial gain			(132)
Obligation, end of period and unfunded status	$ 20,136		$ 20,056