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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)

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