Acquisitions and Divestitures (Tables)

9 Months Ended

Sep. 30, 2011

Acquisitions And Divestitures [Abstract]

Schedule of Business Acquisitions Fair Values Assigned

The following presents the values assigned to the net assets acquired as of the acquisition dates (in thousands):

Assets:
Current	$	(665	)
Noncurrent		54
Oil and natural gas properties		854,835
Total assets acquired	$	854,224
Liabilities:
Current	$	(3,718	)
Asset retirement obligations		6,966
Total liabilities assumed	$	3,248
Net assets acquired	$	850,976

Schedule of pro forma results of operations

The pro forma financial information is not necessarily indicative of the results of operations if the acquisitions had been effective as of this date.

	Three Months Ended September 30,		Nine Months Ended September 30,
	2010		2011		2010
	(in thousands, except per unit amounts)
Total revenues and other	$	249,211	$	1,542,797	$	823,718
Total operating expenses	$	168,114	$	594,942	$	460,805
Net income	$	10,803	$	639,871	$	144,367
Net income per unit:
Basic	$	0.07	$	3.65	$	0.95
Diluted	$	0.07	$	3.64	$	0.94