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Consolidated Statements Of Operations And Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]    
Net sales $ 104,739 $ 95,576
Cost of sales 102,357 97,014
Lower of cost or market inventory adjustment 1,297 11,537
Gross profit 1,085 (12,975)
Research and development 829 651
Selling and administrative expenses 11,683 13,794
Operating loss (11,427) (27,420)
Other expense (income), net 3,067 237
Interest expense 7,546 6,460
Interest income (123) (12)
Loss from continuing operations before provision for income taxes (21,917) (34,105)
Provision for (benefit from) income taxes 361 (295)
Net loss from continuing operations (22,278) (33,810)
(Loss) income from discontinued operations, net of tax (4,066) (2,565)
Net loss (26,344) (36,375)
Other comprehensive income:    
Net loss (26,344) (36,375)
Foreign currency translation adjustments 4,840 12,504
Commodities and foreign currency derivatives and other, net of tax of $10, $13 and $(12), respectively 0 133
Other comprehensive (loss) income, net of tax 4,840 12,637
Comprehensive loss $ (21,504) $ (23,738)