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Components of Accumulated other comprehensive loss (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive loss before income tax effect $ (104,643)   $ (104,643)     $ (105,891)    
Income tax effect 12,779 [1]   12,779 [1]     14,059 [1]    
Accumulated other comprehensive loss (91,864) (139,163) (91,864) (139,163) (91,733) (91,832) (150,297) (151,192)
Other comprehensive income (loss) before reclassifications 423 10,332 406 10,315        
Net amount reclassified to net income (loss) (554) 802 (438) 1,714        
Cost of goods sold 419,820 337,635 842,425 641,327        
Selling, general and administrative expenses 10,618 15,154 20,680 31,453        
Income tax benefit (expense) 1,654 813 560 3,330        
Net of tax 20,344 (29,384) 240 (21,131)        
Defined benefit plans liabilities [Member]
                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive loss before income tax effect (90,836)   (90,836)     (92,177)    
Income tax effect 12,993   12,993     14,256    
Accumulated other comprehensive loss (77,843) (125,302) (77,843) (125,302) (77,766) (77,921) (136,491) (137,441)
Other comprehensive income (loss) before reclassifications 440 10,349 440 10,349        
Net amount reclassified to net income (loss) (517) 840 (362) 1,790        
Equity in investee other comprehensive income [Member]
                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive loss before income tax effect (12,650) [2]   (12,650) [2]     (12,650) [2]    
Income tax effect 384   384     418    
Accumulated other comprehensive loss (12,266) (12,258) (12,266) (12,258) (12,249) (12,232) (12,241) (12,224)
Other comprehensive income (loss) before reclassifications (17) (17) (34) (34)        
Net amount reclassified to net income (loss) 0 0 0 0        
Unrealized loss on financial instruments [Member]
                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive loss before income tax effect (1,157)   (1,157)     (1,064)    
Income tax effect (598)   (598)     (615)    
Accumulated other comprehensive loss (1,755) (1,603) (1,755) (1,603) (1,718) (1,679) (1,565) (1,527)
Other comprehensive income (loss) before reclassifications 0 0 0 0        
Net amount reclassified to net income (loss) (37) (38) (76) (76)        
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plans liabilities [Member]
                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Cost of goods sold 25 910 616 1,994        
Selling, general and administrative expenses 17 304 285 544        
Income tax benefit (expense) (559) (374) (1,263) (748)        
Net of tax (517) 840 (362) 1,790        
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 0 0        
Income tax benefit (expense) (17) (17) (34) (34)        
Net of tax (17) (17) (34) (34)        
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 (46) (46) (93) (93)        
Income tax benefit (expense) 9 8 17 17        
Net of tax $ (37) $ (38) $ (76) $ (76)        
[1] The allocation of the income tax effect to the components of other comprehensive income is as follows: June 30, 2014December 31, 2013Defined benefit plan liabilities$12,993$14,256Equity in investee other comprehensive income384418Unrealized loss on financial instruments(598)(615)
[2] The amount includes our equity in the other comprehensive income of Mt. Holly.