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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Condensed Consolidated Statements Of Comprehensive Income        
Change in value of derivative instruments used as cash flow hedges, tax $ 10,371 $ 1,360 $ 1,187 $ 16,027
Reclassification - derivative settlements, tax 1,906 (6,048) 1,779 (8,062)
Ineffective portion of derivatives, tax $ (1,432) $ 253 $ (702) $ (164)