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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)

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