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Components of accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive loss before income tax effect         $ (109,708) $ (129,913)
Income tax effect [1]         11,466 12,231
Accumulated other comprehensive loss $ (117,604) $ (91,733) $ (117,682) $ (91,832) (98,242) (117,682)
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Accumulated other comprehensive loss, beginning (117,604) (91,733) (117,682) (91,832)    
Other comprehensive income (loss) before reclassifications 18,042 [2] 440 18,042 [2] 440    
Net amount reclassified to net income (loss) 1,320 (571) 1,398 (472)    
Accumulated other comprehensive loss, ending (98,242) (91,864) (98,242) (91,864)    
Defined benefit plan and other postretirement liabilities [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive loss before income tax effect         (108,366) (128,664)
Income tax effect         12,031 12,812
Accumulated other comprehensive loss (115,735) (77,766) (115,852) (77,921) (96,335) (115,852)
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Accumulated other comprehensive loss, beginning (115,735) (77,766) (115,852) (77,921)    
Other comprehensive income (loss) before reclassifications 18,042 [2] 440 18,042 [2] 440    
Net amount reclassified to net income (loss) 1,358 (517) 1,475 (362)    
Accumulated other comprehensive loss, ending (96,335) (77,843) (96,335) (77,843)    
Equity in investee other comprehensive income [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss 0 (12,249) 0 (12,232) 0 0
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Accumulated other comprehensive loss, beginning 0 (12,249) 0 (12,232)    
Other comprehensive income (loss) before reclassifications 0 [2] 0 0 [2] 0    
Net amount reclassified to net income (loss) 0 (17) 0 (34)    
Accumulated other comprehensive loss, ending 0 (12,266) 0 (12,266)    
Unrealized loss on financial instruments [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive loss before income tax effect         (1,342) (1,249)
Income tax effect         (565) (581)
Accumulated other comprehensive loss (1,869) (1,718) (1,830) (1,679) $ (1,907) $ (1,830)
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Accumulated other comprehensive loss, beginning (1,869) (1,718) (1,830) (1,679)    
Other comprehensive income (loss) before reclassifications 0 [2] 0 0 [2] 0    
Net amount reclassified to net income (loss) (38) (37) (77) (76)    
Accumulated other comprehensive loss, ending $ (1,907) $ (1,755) $ (1,907) $ (1,755)    
[1] The allocation of the income tax effect to the components of other comprehensive income is as follows: June 30, 2015December 31, 2014Defined benefit plan liabilities$12,031$12,812Unrealized loss on financial instruments(565)(581)
[2] The gain in other comprehensive income before reclassifications is due to a plan remeasurement related to our labor negotiations, census and other actuarial adjustments.