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Components of accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive loss before income tax effect         $ (112,949) $ (129,913)
Income tax effect [1]         11,083 12,231
Accumulated other comprehensive loss $ (98,242) $ (91,864) $ (117,682) $ (91,832) (101,866) (117,682)
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Accumulated other comprehensive loss, beginning (98,242) (91,864) (117,682) (91,832)    
Other comprehensive income (loss) before reclassifications (4,114) (17) 13,928 [2] 389    
Net amount reclassified to net income (loss) 490 (136) 1,888 (574)    
Accumulated other comprehensive loss, ending (101,866) (92,017) (101,866) (92,017)    
Defined benefit plan and other postretirement liabilities [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive loss before income tax effect         (111,560) (128,664)
Income tax effect         11,639 12,812
Accumulated other comprehensive loss (96,335) (77,843) (115,852) (77,921) (99,920) (115,852)
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Accumulated other comprehensive loss, beginning (96,335) (77,843) (115,852) (77,921)    
Other comprehensive income (loss) before reclassifications (4,114) 0 13,928 [2] 440    
Net amount reclassified to net income (loss) 529 (98) 2,004 (460)    
Accumulated other comprehensive loss, ending (99,920) (77,941) (99,920) (77,941)    
Equity in investee other comprehensive income [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss 0 (12,266) 0 (12,232) 0 0
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Accumulated other comprehensive loss, beginning 0 (12,266) 0 (12,232)    
Other comprehensive income (loss) before reclassifications 0 (17) 0 [2] (51)    
Net amount reclassified to net income (loss) 0 0 0 0    
Accumulated other comprehensive loss, ending 0 (12,283) 0 (12,283)    
Unrealized loss on financial instruments [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive loss before income tax effect         (1,389) (1,249)
Income tax effect         (556) (581)
Accumulated other comprehensive loss (1,907) (1,755) (1,830) (1,679) $ (1,946) $ (1,830)
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Accumulated other comprehensive loss, beginning (1,907) (1,755) (1,830) (1,679)    
Other comprehensive income (loss) before reclassifications 0 0 0 [2] 0    
Net amount reclassified to net income (loss) (39) (38) (116) (114)    
Accumulated other comprehensive loss, ending $ (1,946) $ (1,793) $ (1,946) $ (1,793)    
[1] The allocation of the income tax effect to the components of other comprehensive income is as follows: Defined benefit plan liabilities of $11,639 and $12,812 and Unrealized losses on financial instruments of (556) and (581) at September 30, 2015 and December 31, 2014, respectively.
[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.