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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Interest expense $ (22,278) $ (22,417) $ (67,365) $ (68,872)
Income taxes (37,761) (34,825) (67,381) (54,157)
Other income 1,741 3,300 3,662 5,673
Net income (loss) 82,986 (149,226) (132,988) (696,029)
Reclassification from accumulated other comprehensive income, current period, net of tax (361) (510) 730 (2,540)
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 92 100 275 299
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) (160) (445) (480)
Income taxes 56 60 170 181
Net income (loss) (92) (100) (275) (299)
Amortization of postretirement liability gains (losses) included in net periodic benefit cost        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Reclassification from accumulated other comprehensive income, current period, net of tax 236 382 (1,111) 1,341
Amortization of postretirement liability gains (losses) included in net periodic benefit cost | Reclassification out of accumulated other comprehensive income [Member]        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Income taxes 143 233 (676) 881
Net periodic benefit cost (379) (615) 1,787 (2,222)
Net income (loss) (236) (382) 1,111 (1,341)
Reclassification adjustment for loss on foreign currency translation adjustment 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 0 0 0 802
Reclassification adjustment for loss on foreign currency translation adjustment 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 0 0 0 491
Other income 0 0 0 (1,293)
Net income (loss) 0 0 0 (802)
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 33 28 106 98
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 18 15 57 53
Other income (51) (43) (163) (151)
Net income (loss) $ (33) $ (28) $ (106) $ (98)