CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (707,064)		$ 637,769		$ 603,833
Change in derivatives:
Reclassification to earnings	(382,156)	[1]	(194,693)	[1]	(182,619)	[1]
Ineffectiveness	(1,474)	[2]	2,518	[2]	4,145	[2]
Change in fair value of derivative instruments	130,935	[3]	520,552	[3]	179,649	[3]
Total change in derivatives	(252,695)		328,377		1,175
Change in value of pension and other postretirement liabilities:
Current period net loss	(7,466)	[4]	(4,129)	[4]	(2,148)	[4]
Currrent period prior service cost					16	[5]
Less: Amortization of prior service cost included in net periodic pension cost	1,008	[6]	766	[6]	674	[6]
Total change in value of pension and other postretirement liabilities	(6,458)		(3,363)		(1,458)
Change in currency translation adjustment	529		(561)		(18)
Total comprehensive income (loss)	(965,688)		962,222		603,532
Less: comprehensive loss attributable to the noncontrolling interest					(285)
Comprehensive income (loss) attributable to Southwestern Energy	$ (965,688)		$ 962,222		$ 603,817

[1] Net of ($249.4), ($126.6), and ($118.9) million in taxes for the years ended December 31, 2012, 2011 and 2010, respectively.

[2] Net of ($1.0), $1.6, and $2.6 million in taxes for the years ended December 31, 2012, 2011 and 2010, respectively.

[3] Net of $85.1, $338.4, and $119.5 million in taxes for the years ended December 31, 2012, 2011 and 2010, respectively.

[4] Net of ($4.9), ($2.7), and ($2.0) million in taxes for the years ended December 31, 2012, 2011 and 2010, respectively.

[5] Net of less than $0.1 million in taxes for the year ended December 31, 2010.

[6] Net of $0.7, $0.5, and $0.6 million in taxes for the years ended December 31, 2012, 2011, and 2010, respectively