CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ (38,336)	$ 230,097	$ 12,889	$ 336,127
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	(315)	4,271	(1,465)	9,149
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	1	0	1	0
Other Comprehensive Income (Loss), Net of Tax	(314)	4,271	(1,464)	9,149
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (38,650)	$ 234,368	$ 11,425	$ 345,276