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Derivative Instruments Gains and losses on derivative instruments (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative instruments [Line Items]      
Amount of gain (loss) recognized in accumulated other comprehensive loss (effective portion), net of tax $ (5,594) $ 8,497 $ 7,900
Amount of (gain) loss reclassified from accumulated other comprehensive loss (effective portion), net of tax (4,189) (8,754) 0
Commodity derivatives designated as cash flow hedges:
      
Derivative instruments [Line Items]      
Amount of gain (loss) recognized in accumulated other comprehensive loss (effective portion), net of tax (6,153) 10,209 10,806
Amount of (gain) loss reclassified from accumulated other comprehensive loss (effective portion), net of tax (4,916) (8,788) 0
Amount of gain (loss) recognized in income statement (ineffective portion), before tax (1,422) (730) 1,827
Interest rate derivatives designated as cash flow hedges:
      
Derivative instruments [Line Items]      
Amount of gain (loss) recognized in accumulated other comprehensive loss (effective portion), net of tax 559 (1,712) (2,906)
Amount of (gain) loss reclassified from accumulated other comprehensive loss (effective portion), net of tax 727 34 0
Amount of gain (loss) recognized in income statement (ineffective portion), before tax (769) 0 0
Commodity derivatives not designated as hedging instruments:
      
Derivative instruments [Line Items]      
Amount of gain (loss) recognized in operating revenues, before tax $ (4,845) $ 106 $ 0