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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Change in fair value of derivative instruments, income taxes $ 0 $ 80
Reclassification of (gain) loss on settled contracts, income taxes $ (1,809) $ (1,511)