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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Foreign tax credit carryforwards | $ 20,360 | $ 20,870
Net operating loss carryforwards | 46,304 | 37,838
Employee benefits | 5,456 | 7,353
Inventories | 10,192 | 9,696
Operating lease liabilities | 5,355 | 6,697
Other | 6,899 | 7,649
Gross deferred tax asset | 94,566 | 90,103
Valuation allowance | (37,643) | (35,497)
Net deferred tax asset | 56,923 | 54,606
Deferred tax liabilities: |  |
Tax over book depreciation | (23,938) | (27,613)
Intangible assets | (29,671) | (30,392)
Convertible senior notes discount | 0 | (2,790)
Operating lease assets | (4,355) | (5,884)
Other | (718) | (910)
Deferred tax liability | (58,682) | (67,589)
Net deferred tax liability | $ (1,759) | $ (12,983)

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