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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)