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Pension and other postretirement benefits - Changes in Plan Assets & Benefit Obligation Recognized in OCI (pre-taxed) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Net loss (gain) $ (5,553) $ 41,995 $ (56,795)
Prior service cost (benefit) (1,758) 1,299 0
Amortization of prior service benefit (cost), including recognition due to curtailment 8,351 3,504 3,920
Defined Benefit Pension Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Net loss (gain) 21,133 24,326  
Prior service cost (benefit) 0 1,299  
Amortization of net loss, including recognition due to settlement (3,980) (6,608)  
Amortization of prior service benefit (cost), including recognition due to curtailment (124) (340)  
Total amount recognized in other comprehensive loss 17,029 18,677  
Net periodic benefit cost 3,818 9,488 6,298
Total recognized in net periodic benefit cost and other comprehensive loss 20,847 28,165  
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Net loss (gain) (26,686) 17,669  
Prior service cost (benefit) (1,758) 0  
Amortization of net loss, including recognition due to settlement (3,814) (3,704)  
Amortization of prior service benefit (cost), including recognition due to curtailment 8,475 3,844  
Total amount recognized in other comprehensive loss (23,783) 17,809  
Net periodic benefit cost 3,775 7,871 $ 9,215
Total recognized in net periodic benefit cost and other comprehensive loss $ (20,008) $ 25,680