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Condensed Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Statement of Income and Comprehensive Income [Abstract]        
Change in value of derivative instruments used as cash flow hedges, tax $ 17,256 $ 10,371 $ 16,214 $ 1,187
Reclassification - derivative settlements, tax (6,106) 1,906 (9,270) 1,779
Ineffective portion of derivatives, tax $ (537) $ (1,432) $ 232 $ (702)