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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]        
Change in value of derivative instruments used as cash flow hedges, tax $ 3,874 $ 17,256 $ (2,504) $ 16,214
Reclassification - derivative settlements, tax 317 (6,106) (1,177) (9,270)
Ineffective portion of derivatives, tax $ (667) $ (537) $ (141) $ 232