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Components of Accumulated other comprehensive loss (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive loss before income tax effect $ (105,079)   $ (105,891)  
Income tax effect 13,346   14,059  
Accumulated other comprehensive loss (91,733) (150,297) (91,832) (151,192)
Other comprehensive income (loss) before reclassifications (17) (17)    
Net amount reclassified to net loss 116 912    
Cost of goods sold 422,605 303,692    
Selling, general and administrative expenses 10,062 16,299    
Income tax benefit (expense) (1,094) 2,517    
Net of tax (20,104) 8,253    
Defined benefit plans liabilities [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive loss before income tax effect (91,318)   (92,177)  
Income tax effect 13,552   14,256  
Accumulated other comprehensive loss (77,766) (136,491) (77,921) (137,441)
Other comprehensive income (loss) before reclassifications 0 0    
Net amount reclassified to net loss 155 950    
Equity in investee other comprehensive income [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive loss before income tax effect (12,650)   (12,650)  
Income tax effect 401   418  
Accumulated other comprehensive loss (12,249) (12,241) (12,232) (12,224)
Other comprehensive income (loss) before reclassifications (17) (17)    
Net amount reclassified to net loss 0 0    
Unrealized loss on financial instruments [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive loss before income tax effect (1,111)   (1,064)  
Income tax effect (607)   (615)  
Accumulated other comprehensive loss (1,718) (1,565) (1,679) (1,527)
Other comprehensive income (loss) before reclassifications 0 0    
Net amount reclassified to net loss (39) (38)    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plans liabilities [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cost of goods sold 590 1,084    
Selling, general and administrative expenses 268 240    
Income tax benefit (expense) (703) (374)    
Net of tax 155 950    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Equity in investee other comprehensive income [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cost of goods sold 0 0    
Income tax benefit (expense) (17) (17)    
Net of tax (17) (17)    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized loss on financial instruments [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cost of goods sold (47) (46)    
Income tax benefit (expense) 8 8    
Net of tax $ (39) $ (38)