CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 107,704		$ 136,609
Change in derivatives:
Reclassification to earnings	(97,942)	[1]	(31,658)	[1]
Ineffectiveness	(3,157)	[2]	(58)	[2]
Change in fair value of derivative instruments	166,934	[3]	6,724	[3]
Total change in derivatives	65,835		(24,992)
Change in value of pension and other postretirement liabilities:
Amortization of prior service cost included in net periodic pension cost	254	[4]	197	[4]
Change in currency translation adjustment	481		262
Comprehensive income (loss)	$ 174,274		$ 112,076

[1] (1) Net of ($63.7) and ($20.2) million in taxes for the three months ended March 31, 2012 and 2011, respectively.

[2] (2) Net of ($2.1) and ($0.1) million in taxes for the three months ended March 31, 2012 and 2011, respectively.

[3] (3) Net of $108.5 and $4.3 million in taxes for the three months ended March 31, 2012 and 2011, respectively.

[4] (4) Net of $0.2 and $0.1 million in taxes for the three months ended March 31, 2012 and 2011, respectively.