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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME    
Net income $ 107,031 $ 42,824
Other comprehensive income / (loss), net of taxes:    
Reclassification adjustment for settled hedge contracts 42,565 [1] (9,325) [1]
Changes in fair value of hedge contracts (80,175) [2] (36,975) [2]
Postretirement benefits:    
Amortization of net loss   125 [3]
Total other comprehensive income / (loss) (37,610) (46,175)
Comprehensive income / (loss) $ 69,421 $ (3,351)
[1] Net of income taxes of $(28,210) and $6,045 for the three months ended March 31, 2014 and 2013, respectively.
[2] Net of income taxes of $53,135 and $23,971 for the three months ended March 31, 2014 and 2013, respectively.
[3] Net of income taxes of $(80) for the three months ended March 31, 2013.