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Components of Accumulated other comprehensive loss (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive loss before income tax effect $ (104,239)   $ (104,239)     $ (105,891)    
Income tax effect 12,222 [1]   12,222 [1]     14,059 [1]    
Accumulated other comprehensive loss (92,017) (138,680) (92,017) (138,680) (91,864) (91,832) (139,163) (151,192)
Other comprehensive income (loss) before reclassifications (17) (17) 389 10,298        
Net amount reclassified to net income (loss) (136) 500 (574) 2,214        
Cost of goods sold 424,918 387,574 1,267,343 1,028,901        
Selling, general and administrative expenses 12,146 14,422 32,826 45,875        
Income tax benefit (expense) 6,444 1,384 7,004 4,714        
Net of tax 50,405 (9,507) 50,645 (30,638)        
Defined benefit plans liabilities [Member]
                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive loss before income tax effect (90,386)   (90,386)     (92,177)    
Income tax effect 12,445   12,445     14,256    
Accumulated other comprehensive loss (77,941) (124,764) (77,941) (124,764) (77,843) (77,921) (125,302) (137,441)
Other comprehensive income (loss) before reclassifications 0 0 440 10,349        
Net amount reclassified to net income (loss) (98) 538 (460) 2,328        
Equity in investee other comprehensive income [Member]
                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive loss before income tax effect (12,651) [2]   (12,651) [2]     (12,650) [2]    
Income tax effect 368   368     418    
Accumulated other comprehensive loss (12,283) (12,275) (12,283) (12,275) (12,266) (12,232) (12,258) (12,224)
Other comprehensive income (loss) before reclassifications (17) (17) (51) (51)        
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 (1,202)   (1,202)     (1,064)    
Income tax effect (591)   (591)     (615)    
Accumulated other comprehensive loss (1,793) (1,641) (1,793) (1,641) (1,755) (1,679) (1,603) (1,527)
Other comprehensive income (loss) before reclassifications 0 0 0 0        
Net amount reclassified to net income (loss) (38) (38) (114) (114)        
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined benefit plans liabilities [Member]
                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Cost of goods sold 308 764 924 2,758        
Selling, general and administrative expenses 142 148 427 692        
Income tax benefit (expense) (548) (374) (1,811) (1,122)        
Net of tax (98) 538 (460) 2,328        
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) (51) (51)        
Net of tax (17) (17) (51) (51)        
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) (139) (139)        
Income tax benefit (expense) 8 8 25 25        
Net of tax $ (38) $ (38) $ (114) $ (114)        
[1] The allocation of the income tax effect to the components of other comprehensive income is as follows: September 30, 2014December 31, 2013Defined benefit plan liabilities$12,445$14,256Equity in investee other comprehensive income368418Unrealized loss on financial instruments(591)(615)
[2] The amount includes our equity in the other comprehensive income of Mt. Holly.