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Reclassification out of accumulated other comprehensive income (loss) (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Interest expense $ (20,909) $ (22,278) $ (61,978) $ (67,365)
Income taxes (46,930) (37,761) (74,406) (67,381)
Other income 1,011 1,741 2,809 3,662
Net income (loss) 87,351 82,986 165,891 (132,988)
Reclassification from accumulated other comprehensive income, current period, net of tax (452) (361) (1,370) 730
Reclassification adjustment for loss on derivative instruments included in net income (loss)        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Reclassification from accumulated other comprehensive income, current period, net of tax 92 92 275 275
Reclassification adjustment for loss on derivative instruments included in net income (loss) | Reclassification out of accumulated other comprehensive income [Member] | Interest rate contract [Member]        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Interest expense (148) (148) (443) (445)
Income taxes 56 56 168 170
Net income (loss) (92) (92) (275) (275)
Amortization of postretirement liability gains (losses) included in net periodic benefit cost (credit)        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Reclassification from accumulated other comprehensive income, current period, net of tax 333 236 1,002 (1,111)
Amortization of postretirement liability gains (losses) included in net periodic benefit cost (credit) | Reclassification out of accumulated other comprehensive income [Member]        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Income taxes 203 143 609 (676)
Net periodic benefit cost (credit) (536) (379) (1,611) 1,787
Net income (loss) (333) (236) (1,002) 1,111
Reclassification adjustment for loss on available-for-sale investments included in net income (loss)        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Reclassification from accumulated other comprehensive income, current period, net of tax 27 33 93 106
Reclassification adjustment for loss on available-for-sale investments included in net income (loss) | Reclassification out of accumulated other comprehensive income [Member]        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Income taxes 14 18 50 57
Other income (41) (51) (143) (163)
Net income (loss) $ (27) $ (33) $ (93) $ (106)