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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]    
Change in value of derivative instruments used as cash flow hedges, tax $ (1,041) $ (9,184)
Reclassification - derivative settlements, tax (3,164) (127)
Ineffective portion of derivatives, tax $ 769 $ 730