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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Condensed Consolidated Statements Of Comprehensive Income [Abstract]  
Reclassification adjustment for settled contracts, taxes$ 0$ 125,000
Changes in fair value of hedge positions, tax$ 0$ 5,000