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Pension and other postretirement benefits - Funded status of plans (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Current liabilities $ (10,148) $ (10,159)
Defined Benefit Pension Plans [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Funded status (45,709) (30,772)
Non-current assets 0 30,842
Current liabilities (1,743) (1,744)
Non-current liabilities (43,966) (59,870)
Net amount recognized (45,709) (30,772)
Net loss 80,514 63,360
Prior service cost (benefit) 1,211 1,335
Total 81,725 64,695
Projected benefit obligation for plans with accumulated benefit obligations in excess of plan assets 326,571 336,292
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets 319,873 328,963
Fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets 280,862 305,520
Other Postretirement Benefit Plans [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Funded status (132,550) (158,781)
Non-current assets 0 0
Current liabilities (6,551) (6,118)
Non-current liabilities (125,999) (152,663)
Net amount recognized (132,550) (158,781)
Net loss 49,562 79,720
Prior service cost (benefit) (9,377) (15,751)
Total $ 40,185 $ 63,969