Income Taxes - Components of Deferred Income Tax Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax liabilities:
Plant, equipment, and intangibles	$ (105,986)	$ (92,271)
Plant, equipment, and intangibles	(19,139)	(17,610)
Total Deferred Tax Liabilities, Gross	(125,125)	(109,881)
Deferred income tax assets:
Postretirement, pensions, and stock compensation	32,139	35,394
Reserves and accruals	19,617	24,388
Net operating loss, capital loss, and tax credit carryforwards	94,537	107,028
Lease liability	19,881	18,515
Valuation allowances	(68,719)	(84,308)
Deferred tax assets	97,455	101,017
Net deferred income tax liability	$ (27,670)	$ (8,864)