CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 127,515		$ 107,704
Change in derivatives:
Reclassification to earnings: Settlements	(47,173)	[1]	(97,942)	[1]
Reclassification to earnings: Ineffectiveness	(781)	[2]	(3,157)	[2]
Change in fair value of derivative instruments	(45,481)	[3]	166,934	[3]
Total change in derivatives	(93,435)		65,835
Change in value of pension and other postretirement liabilities:
Amortization of prior service cost included in net periodic pension cost	267	[4]	254	[4]
Change in currency translation adjustment	(1,029)		481
Comprehensive income	$ 33,318		$ 174,274

[1] Net of $(31.4) and $(63.7) million in taxes for the three months ended March 31, 2013 and 2012.

[2] Net of $(0.5) and $(2.1) million in taxes for the three months ended March 31, 2013 and 2012.

[3] Net of $(30.3) and $108.5 million in taxes for the three months ended March 31, 2013 and 2012.

[4] Net of $0.2 and $0.2 million in taxes for the three months ended March 31, 2013 and 2012.