CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 637,769		$ 603,833		$ (35,792)
Change in derivatives:
Reclassification to earnings	(194,693)	[1]	(182,619)	[1]	(376,259)	[1]
Ineffectiveness	2,518	[2]	4,145	[2]	(6,031)	[2]
Change in fair value of derivative instruments	520,552	[3]	179,649	[3]	218,699	[3]
Total change in derivatives	328,377		1,175		(163,591)
Change in value of pension and other postretirement liabilities:
Current period net loss	(4,129)	[4]	(2,148)	[4]	(477)	[4]
Current period prior service cost	0	[5]	16	[5]	(57)	[5]
Less: amortization of prior service cost included in net periodic pension cost	766	[6]	674	[6]	736	[6]
Total change in value of pension and other postretirement liabilities	(3,363)	[4]	(1,458)	[4]	202	[4]
Change in currency translation adjustment	(561)		(18)		0
Total comprehensive income (loss)	962,222		603,532		(199,181)
Less: comprehensive loss attributable to the noncontrolling interest	0		(285)		(142)
Comprehensive income (loss) attributable to Southwestern Energy	$ 962,222		$ 603,817		$ (199,039)

[1] (1) Net of ($126.6), ($118.9) and ($234.1) million in taxes for the years ended December 31, 2011, 2010 and 2009, respectively.

[2] (2) Net of $1.6, $2.6, and ($3.8) million in taxes for the years ended December 31, 2011, 2010 and 2009, respectively.

[3] (3) Net of $338.4, $119.5 and $137.7 million in taxes for the years ended December 31, 2011, 2010 and 2009, respectively.

[4] (4) Net of ($2.7), ($2.0), and ($0.2) million in taxes for the years ended December 31, 2011, 2010 and 2009, respectively.

[5] (5) Net of less than $0.1 and ($0.1) million in taxes for the years ended December 31, 2010 and 2009, respectively.

[6] (6) Net of $0.5, $0.6, and $0.5 million in taxes for the years ended December 31, 2011, 2010 and 2009, respectively.