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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME        
Net income $ 118,420 $ 89,114 $ 225,451 $ 131,938
Other comprehensive income (loss), net of taxes:        
Reclassification adjustment for settled cash flow hedge contracts 13,807 [1] (1,105) [1] 56,372 [1] (10,430) [1]
Changes in fair value of cash flow hedge contracts   69,839 [2] (80,175) [2] 32,864 [2]
Postretirement benefits:        
Amortization of net loss   124 [3]   249 [3]
Total other comprehensive income (loss) 13,807 68,858 (23,803) 22,683
Comprehensive income (loss) $ 132,227 $ 157,972 $ 201,648 $ 154,621
[1] Net of income taxes of $(9,149) and $717 for the three months ended June 30, 2014 and 2013, respectively, and $(37,359) and $6,762 for the six months ended June 30, 2014 and 2013, respectively.
[2] Net of income taxes of $(45,274) for the three months ended June 30, 2013 and $53,135 and $(21,303) for the six months ended June 30, 2014 and 2013, respectively.
[3] Net of income taxes of $(81) and $(161) for the three and six months ended June 30, 2013, respectively.