Income Taxes - Components of Deferred Income Tax Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred income tax liabilities:
Plant, equipment, and intangibles	$ (98,112)	$ (94,189)
Right of use asset	(21,440)	(19,853)
Deferred tax liabilities	(119,552)	(114,042)
Deferred income tax assets:
Postretirement, pensions, and stock compensation	17,052	17,368
Reserves and accruals	41,474	25,519
Net operating loss, capital loss, and tax credit carryforwards	114,896	149,607
Lease liability	22,073	19,938
Valuation allowances	(109,676)	(142,330)
Deferred tax assets	85,819	70,102
Net deferred income tax liability	$ (33,733)	$ (43,940)