CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 703,503		$ (707,064)		$ 637,769
Change in derivatives:
Reclassification to earnings	(185,506)	[1]	(382,156)	[1]	(194,693)	[1]
Ineffectiveness	991	[2]	(1,474)	[2]	2,518	[2]
Change in fair value of derivative instruments	21,619	[3]	130,935	[3]	520,552	[3]
Total change in derivatives	(162,896)		(252,695)		328,377
Change in value of pension and other postretirement liabilities:
Current period net gain (loss)	11,673	[4]	(7,466)	[4]	(4,129)	[4]
Less: amortization of prior service cost included in net periodic pension cost	1,080		1,008		766
Total change in value of pension and other postretirement liabilities	12,753	[5]	(6,458)	[5]	(3,363)	[5]
Change in currency translation adjustment	(4,003)		529		(561)
Comprehensive income (loss)	$ 549,357		$ (965,688)		$ 962,222

[1] Net of ($123.7), ($249.4), and ($126.6) million in taxes for the years ended December 31, 2013, 2012 and 2011, respectively.

[2] Net of $0.7, ($1.0), and $1.6 million in taxes for the years ended December 31, 2013, 2012 and 2011, respectively.

[3] Net of $16.3, $85.1, and $338.4 million in taxes for the years ended December 31, 2013, 2012 and 2011, respectively.

[4] Net of $7.5, ($4.9), and ($2.7) million in taxes for the years ended December 31, 2013, 2012 and 2011, respectively.

[5] Net of $0.7, $0.7, and $0.5 million in taxes for the years ended December 31, 2013, 2012, and 2011, respectively.