Quarterly Results (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Results (Unaudited)

Schedule of Quarterly Financial Information [Table Text Block]

	1st Quarter	2nd Quarter	3rd Quarter	4th Quarter
	(in thousands, except per share amounts)
	2011
Operating revenues	$    676,335	$   765,166	$   767,255	$    744,150
Operating income	232,651	282,542	295,718	263,890
Net income	136,609	167,454	175,173	158,533
Net income attributable to Southwestern Energy	136,609	167,454	175,173	158,533
Earnings per share attributable to Southwestern Energy stockholders – Basic	0.39	0.48	0.50	0.47
Earnings per share attributable to Southwestern Energy stockholders – Diluted	0.39	0.48	0.50	0.45
	2010
Operating revenues	$     668,117	$     589,943	$     682,172	$     670,431
Operating income (loss)	288,090	206,317	270,136	256,685
Net income (loss)	171,768	122,009	160,638	149,418
Net income (loss) attributable to Southwestern Energy	171,797	122,069	160,741	149,511
Earnings per share attributable to Southwestern Energy stockholders – Basic	0.50	0.35	0.47	0.43
Earnings per share attributable to Southwestern Energy stockholders – Diluted	0.49	0.35	0.46	0.43