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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME        
Net income $ 89,114 $ 35,937 $ 131,938 $ 54,255
Other comprehensive income / (loss), net of taxes:        
Reclassification adjustment for settled hedge contracts (1,105) [1] (44,579) [1] (10,430) [1] (78,649) [1]
Changes in fair value of hedge contracts 69,839 [2] 11,246 [2] 32,864 [2] 54,451 [2]
Pension and postretirement benefits:        
Amortization of prior service cost   67 [3]   135 [3]
Amortization of net loss 124 [4] 4,174 [4] 249 [4] 8,349 [4]
Total other comprehensive income / (loss) 68,858 (29,092) 22,683 (15,714)
Comprehensive income / (loss) $ 157,972 $ 6,845 $ 154,621 $ 38,541
[1] Net of income taxes of $717 and $28,263 for the three months ended June 30, 2013 and 2012, respectively, and $6,762 and $49,863 for the six months ended June 30, 2013 and 2012, respectively.
[2] Net of income taxes of $(45,274) and $(7,130) for the three months ended June 30, 2013 and 2012, respectively, and $(21,303) and $(34,653) for the six months ended June 30, 2013 and 2012, respectively.
[3] Net of income taxes of $0 and $(43) for the three months ended June 30, 2013 and 2012, respectively, and $0 and $(86) for the six months ended June 30, 2013 and 2012, respectively.
[4] Net of income taxes of $(81) and $(2,647) for the three months ended June 30, 2013 and 2012, respectively, and $(161) and $(5,294) for the six months ended June 30, 2013 and 2012, respectively.