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Income Taxes - Components of Deferred Income Tax Balances (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax liabilities: |  |
Plant, equipment, and intangibles | $ (96,254) | $ (98,141)
Deferred income tax assets: |  |
Postretirement, pensions, and stock compensation | 30,338 | 27,549
Reserves and accruals | 16,371 | 20,641
Net operating loss and tax credit carryforwards | 76,456 | 79,703
Valuation allowances | (50,420) | (39,402)
Deferred tax assets | 72,745 | 88,491
Net deferred income tax asset | $ (23,509) | $ (9,650)

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