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Income Taxes (Schedule Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Postretirement and other employee benefits $ 18,202 $ 18,256
Foreign tax credit and other carryforwards 37,101 55,103
Capitalized research and experimental costs 3,897 5,566
Environmental reserves 1,111 1,110
Inventory adjustments 7,381 14,863
Long-term contract option amortization 1,031 1,080
Provision for rationalization charges 96 232
Deferred Tax Assets, Derivative Instruments 3,552 768
Other 3,646 1,104
Total gross deferred tax assets 76,017 98,082
Less: valuation allowance (12,773) (13,736)
Total deferred tax assets 63,244 84,346
Deferred tax liabilities:    
Fixed assets 54,485 56,659
Inventory 8,573 12,778
Goodwill and acquired intangibles 7,552 6,996
Other 3,254 2,468
Total deferred tax liabilities 73,864 78,901
Net deferred tax liability $ 10,620  
Net deferred tax asset   $ 5,445