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Supplemental financial statement info Components of Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive loss before income tax effect $ (105,891) $ (166,815)    
Income tax effect (2) 14,059 [1] 15,623 [1]    
Accumulated other comprehensive loss (91,832) (151,192) (134,588) (49,976)
Defined benefit plan liabilities [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive loss before income tax effect (92,177) (153,225)    
Income tax effect (2) 14,256 15,784    
Accumulated other comprehensive loss (77,921) (137,441) (124,948) (41,181)
Equity in investee other comprehensive income [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive loss before income tax effect (12,650) [2] (12,712) [2]    
Income tax effect (2) 418 488    
Accumulated other comprehensive loss (12,232) (12,224) (7,918) (7,665)
Unrealized loss on financial instruments [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive loss before income tax effect (1,064) (878)    
Income tax effect (2) (615) (649)    
Accumulated other comprehensive loss $ (1,679) $ (1,527) $ (1,722) $ (1,130)
[1] The allocation of the income tax effect to the components of other comprehensive income is as follows: 20132012Defined benefit plan liabilities$14,256$15,784Equity in investee other comprehensive income418488Unrealized loss on financial instruments(615)(649)
[2] The amount includes our equity in the other comprehensive income of Mt. Holly.