CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $) In Thousands, unless otherwise specified	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Common Stock in Treasury	Total
Balance at Dec. 31, 2011	$ 3,491	$ 903,399	$ 2,656,214	$ 408,428	$ (2,228)	$ 3,969,304
Balance, shares at Dec. 31, 2011	349,059
Comprehensive income:
Net income attributable to Southwestern Energy	0	0	107,704	0	0	107,704
Other comprehensive income	0	0	0	66,570	0	66,570
Total comprehensive income	0	0	0	0	0	174,274
Stock-based compensation	0	5,708	0	0	0	5,708
Exercise of stock options, shares	189
Exercise of stock options	1	2,539	0	0	0	2,540
Issuance of restricted stock, shares	2
Issuance of restricted stock	0	0	0	0	0	0
Cancellation of restricted stock, shares	(23)
Cancellation of restricted stock	0	0	0	0	0	0
Treasury stock - non-qualified plan	0	0	0	0	(67)	(67)
Balance at Mar. 31, 2012	$ 3,492	$ 911,646	$ 2,763,918	$ 474,998	$ (2,295)	$ 4,151,759
Balance, shares at Mar. 31, 2012	349,227