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Comprehensive income (loss) reclassifications (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Other comprehensive income (loss), reclassification adjustment on derivatives included in net income, before tax $ 4,398  
Less: Reclassification adjustment for gain on derivative instruments included in net income, tax (1,626) (1,366)
Amounts reclassified from accumulated other comprehensive gain (loss) 2,772 2,329
Other comprehensive income (loss) amortization of postretirement losses included in net periodic benefit cost, before tax (967)  
Amortization of postretirement liability losses included in net periodic benefit cost, tax 319 0
Other comprehensive income reclassification of defined benefit plans amortization of gain (loss) recognized in net periodic benefit cost, net of tax (648) 0
Other comprehensive income (loss), reclassification adjustment for sale of securities included in net income, before tax (54)  
Less: Reclassification adjustment for loss on available-for-sale investments included in net income, tax 19 16
Other comprehensive income (loss), reclassification adjustment for sale of securities included in net income, net of tax (35) (30)
Other comprehensive income loss reclassification adjustments net of tax 2,089  
Commodity derivative instruments
    
Other comprehensive income (loss), reclassification adjustment on derivatives included in net income, before tax 4,513  
Interest rate derivative instruments
    
Other comprehensive income (loss), reclassification adjustment on derivatives included in net income, before tax $ (115)