CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows From Operating Activities
Net income attributable to Southwestern Energy	$ 107,704	$ 136,609
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	194,439	164,667
Deferred income taxes	70,550	88,880
Unrealized gain on derivatives	(7,324)	(1,080)
Stock-based compensation	2,844	2,450
Other	2,607	6
Change in assets and liabilities:
Accounts receivable	42,604	11,983
Inventories	3,335	8,625
Accounts payable	4,912	(10,347)
Taxes payable	8,285	(13,645)
Interest payable	(6,717)	(9,813)
Advances from partners	34,235	11,600
Other assets and liabilities	(12,811)	6,544
Net cash provided by operating activities	444,663	396,479
Cash Flows From Investing Activities
Capital investments	(557,631)	(526,139)
Proceeds from sale of property and equipment	651	11,056
Other	1,770	(375)
Net cash used in investing activities	(555,210)	(515,458)
Cash Flows From Financing Activities
Payments on revolving long-term debt	(1,271,300)	(782,800)
Borrowings under revolving long-term debt	599,800	892,700
Proceeds from issuance of long-term debt	998,780	0
Debt Issuance Costs	(8,183)	0
Change in bank drafts outstanding	(20,520)	17,749
Payments of Loan Costs	0	(10,103)
Proceeds from exercise of common stock options	2,540	2,743
Net cash provided by financing activities	301,117	120,289
Effect of exchange rate changes on cash	(30)	22
Increase in cash and cash equivalents	190,540	1,332
Cash and cash equivalents at beginning of year	15,627	16,055
Cash and cash equivalents at end of period	$ 206,167	$ 17,387