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Income Taxes (Schedule Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:      
Postretirement and other employee benefits $ 18,395 $ 19,392  
Foreign tax credit and other carryforwards 111,325 175,229  
Capitalized research and experimental costs 7,695 9,417  
Environmental reserves 976 493  
Inventory 14,251 7,933  
Original issue discount 0 2,603  
Long-term contract option amortization 1,144 1,204  
Provision for rationalization charges 351 502  
Other 4,270 1,536  
Total gross deferred tax assets 158,407 218,309  
Less: valuation allowance (58,446) (150,839)  
Total deferred tax assets 99,961 67,470 $ 6,500
Deferred tax liabilities:      
Fixed assets 59,521 68,098  
Debt discount amortization / Deferred financing fees 0 3,191  
Inventory 7,751 5,128  
Goodwill and acquired intangibles 3,668 0  
Other 3,138 2,031  
Total deferred tax liabilities 74,078 78,448  
Total deferred tax liabilities $ 25,883 $ 10,978