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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME      
Net income $ 131,730 $ 122,408 $ 103,386
Other comprehensive income / (loss), net of taxes:      
Reclassification adjustment for settled hedge contracts (144,456) [1] (52,840) [1] (107,256) [1]
Changes in fair value of hedge contracts 53,815 [2] 163,704 [2] 45,878 [2]
Defined benefit pension and postretirement plans:      
Net gain / (loss) 1,258 [3] (13,814) [3] 5,693 [3]
Plan termination and amendment     506 [4]
Settlement   3,380 [5] 2,493 [5]
Amortization of net obligation at transition   387 [6] 392 [6]
Amortization of prior service cost 134 [7] 640 [7] 355 [7]
Amortization of net loss 8,582 [8] 6,718 [8] 5,788 [8]
Foreign currency translation adjustment   55 [9] 32 [9]
Total other comprehensive income / (loss) (80,667) 108,230 (46,119)
Comprehensive income / (loss) $ 51,063 $ 230,638 $ 57,267
[1] Net of income taxes of $91,870, $33,500 and $65,734 for the year ended December 31, 2012, 2011 and 2010, respectively.
[2] Net of income taxes of $(34,890), $(103,963) and $(29,777) for the year ended December 31, 2012, 2011 and 2010, respectively.
[3] Net of income taxes of $(815), $9,085 and $(3,245) for the year ended December 31, 2012, 2011 and 2010, respectively.
[4] Net of income taxes of $0, $0 and $(310) for the year ended December 31, 2012, 2011 and 2010, respectively.
[5] Net of income taxes of $0, $(2,143) and $(1,528) for the year ended December 31, 2012, 2011 and 2010, respectively.
[6] Net of income taxes of $0, $(245) and $(240) for the year ended December 31, 2012, 2011 and 2010, respectively.
[7] Net of income taxes of $(87), $(406) and $(217) for the year ended December 31, 2012, 2011 and 2010, respectively.
[8] Net of income taxes of $(5,324), $(4,257) and $(3,548) for the year ended December 31, 2012, 2011 and 2010, respectively.
[9] Net of income taxes of $0, $(34) and $(20) for the year ended December 31, 2012, 2011 and 2010, respectively.