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Reclassification out of accumulated other comprehensive income (loss) (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Revenues $ 1,370,455 $ 1,285,782 $ 3,507,354 $ 3,277,980
Interest expense (22,425) (21,012) (64,912) (63,312)
Other income 2,644 2,326 7,552 5,003
Income before income taxes 156,887 131,126 320,900 287,093
Income taxes 54,769 46,576 109,818 99,559
Loss from equity method investments (97) (61) (343) (380)
Net income (loss) 102,121 84,432 211,588 187,280
Reclassification adjustment for gain (loss) on derivative instruments included in net income
        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Income before income taxes (132) 807 (703) 5,924
Income taxes 50 (297) 264 (2,246)
Net income (loss) (82) 510 (439) 3,678
Amortization of postretirement liability losses included in net periodic benefit cost
        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Net periodic benefit cost (420) (437) (1,258) (2,371)
Income taxes 159 166 477 1,027
Net income (loss) (261) (271) (781) (1,344)
Reclassification adjustment for loss on foreign currency translation adjustment included in net income
        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Loss from equity method investments 0 (185) 0 (213)
Earnings from equity method investments, tax 0 70 0 70
Net income (loss) 0 (115) 0 (143)
Reclassification adjustment for loss on available-for-sale investments included in net income
        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Other income (47) (58) (154) (180)
Income taxes 16 20 54 63
Net income (loss) (31) (38) (100) (117)
Total reclassifications
        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Net income (loss) (374) 86 (1,320) 2,074
Commodity derivative instruments [Member] | Reclassification adjustment for gain (loss) on derivative instruments included in net income
        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Revenues 28 1,007 (223) 6,903
Interest rate derivative instruments [Member] | Reclassification adjustment for gain (loss) on derivative instruments included in net income
        
Reclassification adjustment out of accumulated other comprehensive income [Line Items]        
Interest expense $ (160) $ (200) $ (480) $ (979)