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Income taxes- Deferred Tax Assets And Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Fixed assets |  | $ 41,677
Postretirement and other employee benefits | $ 19,392 | 32,275
Foreign tax credit and other carryforwards | 175,229 | 153,169
Capitalized research and experimental costs | 9,417 | 18,146
Environmental reserves | 493 | 4,237
Inventory | 7,933 | 15,227
Original issue discount | 2,603 | 6,461
Long-term contract option amortization | 1,204 | 2,074
Provision for rationalization charges | 502 | 7,498
Other | 1,536 | 3,391
Total gross deferred tax assets | 218,309 | 284,155
Less: valuation allowance | (150,839) | (244,841)
Total deferred tax assets | 67,470 | 39,314
Deferred tax liabilities: |  |
Fixed assets | 68,098 | 47,346
Debt discount amortization / Deferred financing fees | 3,191 | 6,544
Inventory | 5,128 | 3,482
Goodwill and acquired intangibles |  | 2,295
Other | 2,031 | 2,751
Total deferred tax liabilities | 78,448 | 62,418
Net deferred tax liability | $ (10,978) | $ (23,104)

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