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Income Taxes - Temporary Differences Related to Deferred Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred income tax assets: |  |
Post-retirement liability | $ 770 | $ 910
Deferred income | 393 | 543
Share-based compensation | 1,581 | 1,158
Capital loss carryforwards | 379 | 0
State tax credit carryforwards | 3,245 | 3,488
State operating loss carryforwards | 1,505 | 1,434
Inventories | 1,476 | 1,346
Other | 1,231 | 766
Gross deferred income tax assets | 10,580 | 9,645
Less: valuation allowance | (1,452) | (148)
Net deferred income tax assets | 9,128 | 9,497
Deferred income tax liabilities: |  |
Fixed assets | (10,497) | (9,255)
Other | (308) | (254)
Gross deferred income tax liabilities | (10,805) | (9,509)
Net deferred income tax liability | $ (1,677) | $ (12)

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