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Reclassifications out of accumulated other comprehensive (loss) (Details 15) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Interest expense                 $ (93,068) $ (86,906) $ (83,803)
Income taxes                 (65,603) (63,227) (74,294)
Other income                 19,232 9,873 6,086
Income from continuing operations                 114,694 179,163 168,691
Income (loss) from discontinued operations, net of tax $ 6,261 $ (202,626) $ (251,415) $ (324,605) $ 27,700 $ 38,482 $ 23,881 $ 25,112 (772,385) 115,175 109,879
Net income (loss)                 (657,691) 294,338 $ 278,570
Reclassification from accumulated other comprehensive income, current period, net of tax                 (3,131) (1,625)  
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                 404 694  
Reclassification adjustment for loss on derivative instruments included in net income (loss): | Reclassification out of accumulated other comprehensive income [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net income (loss)                 (404) (694)  
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                 (637) (639)  
Income taxes                 233 240  
Income from continuing operations                 (404) (399)  
Reclassification adjustment for loss on derivative instruments included in net income (loss): | Reclassification out of accumulated other comprehensive income [Member] | Commodity derivatives {Member}                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Income (loss) from discontinued operations, net of tax                 0 (295)  
Amortization of postretirement liability 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                 1,794 796  
Amortization of postretirement liability 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                 1,128 492  
Net periodic benefit cost                 (2,922) (1,288)  
Net income (loss)                 (1,794) (796)  
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                 802 0  
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                 490 0  
Other income                 (1,292) 0  
Net income (loss)                 (802) 0  
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                 131 135  
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                 70 73  
Other income                 (201) (208)  
Net income (loss)                 $ (131) $ (135)