CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (488,100)		$ 167,454		$ (380,396)		$ 304,063
Change in derivatives:
Reclassification to earnings	(117,944)	[1]	(32,756)	[1]	(215,886)	[1]	(64,414)	[1]
Ineffectiveness	1,620	[2]	(1,209)	[2]	(1,537)	[2]	(1,267)	[2]
Change in fair value of derivative instruments	(36,481)	[3]	82,584	[3]	130,453	[3]	89,308	[3]
Total change in derivatives	(152,805)		48,619		(86,970)		23,627
Change value of pension and other postretirement liabilities:
Amortization of prior service cost included in net periodic pension cost	254	[4]	196	[4]	508	[4]	393	[4]
Change in currency translation adjustment	(516)		126		(35)		388
Comprehensive income (loss)	$ (641,167)		$ 216,395		$ (466,893)		$ 328,471

[1] Net of ($76.7), ($20.9), ($140.4) and ($41.2) million in taxes for the three months ended June 30, 2012 and 2011, and the six months ended June 30, 2012 and 2011, respectively.Net of $ 1.1, ($0.8), ($1.0) and ($0.8) million in taxes for the three months ended June 30, 2012 and 2011, and the six months ended June 30, 2012 and 2011, respectively.

[2] Net of $ 1.1, ($0.8), ($1.0) and ($0.8) million in taxes for the three months ended June 30, 2012 and 2011, and the six months ended June 30, 2012 and 2011, respectively.

[3] Net of ($23.7), $ 52.8, $ 84.8 and $ 57.1 million in taxes for the three months ended June 30, 2012 and 2011, and the six months ended June 30, 2012 and 2011, respectively.

[4] Net of $ 0.1, $ 0.1, $ 0.3 and $ 0.2 million in taxes for the three months ended June 30, 2012 and 2011, and the six months ended June 30, 2012 and 2011, respectively.