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Consolidated Statement Of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statement Of Comprehensive Income [Abstract]    
Reclassification adjustment for settled contracts, taxes $ 0 $ 125
Changes in fair value of hedge positions, tax $ 0 $ 5