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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Consolidated Statements of Comprehensive Income [Abstract]        
Net income (loss) $ (29,671) $ 63,974 $ 60,233 $ 152,019
Net unrealized gain (loss) on derivative instruments arising during the period, net of tax (9,125) 32,547 7,962 31,787
Less: Reclassification adjustment for gain (loss) on derivative instruments included in net income, net of tax 7,782 (534) 7,029 77
Net unrealized gain (loss) on derivative instruments qualifying as hedges (16,907) 33,081 933 31,710
Foreign currency translation adjustment, net of tax (5) (1,401) (440) (1,140)
Net unrealized gain (loss) on available-for-sale investments, net of tax 39 0 60 103
Other comprehensive income (loss) (16,873) 31,680 553 30,673
Comprehensive income (loss) (46,544) 95,654 60,786 182,692
Other comprehensive income (loss), Parenthetical [Abstract]        
Net unrealized gain (loss) on derivative instruments arising during the period, tax (5,377) 19,481 4,570 19,367
Reclassification adjustment for gain (loss) on derivative instruments included in net income, tax 4,570 (320) 4,126 45
Foreign currency translation adjustment, tax (8) (905) (273) (736)
Net unrealized gains (loss) on available-for-sale investments, tax $ 21 $ 0 $ 32 $ 56