Acquisitions and Divestitures (Tables)

9 Months Ended

Sep. 30, 2013

Acquisitions and divestitures [Abstract]

Schedule of Purchase Price Allocation

We believe these estimates are reasonable; however, the estimates are subject to change as additional information becomes available and is assessed by us (in thousands):

Adjusted Purchase Price
Total consideration given	$	592,627
Adjusted Allocation of Purchase Price
Oil and natural gas properties included in the full cost pool:
Proved oil and natural gas properties	$	260,799
Undeveloped oil and natural gas properties	353,343
Total oil and natural gas properties included in the full cost pool (1)	614,142
Equipment and facilities	25,163
Asset retirement obligation	(46,678		)
Fair value of net assets acquired	$	592,627

(1) We used a discounted cash flow model and made market assumptions as to future commodity prices, projections of estimated quantities of oil and natural gas reserves, expectations for timing and amount of future development and operating costs, projections of future rates of production, expected recovery rates and risk adjusted discount rates.

Pro Forma Results

Future results may vary significantly from the results reflected in this pro forma financial information because of future events and transactions, as well as other factors.

	Three Months Ended September 30,		Nine Months Ended September 30,
	2012		2012
	(In thousands, except per share data)
Pro forma:
Revenues	$	335,394	$	1,041,350
Net income	$	47,186	$	140,670
Net income per common share:
Basic	$	0.98	$	2.94
Diluted	$	0.98	$	2.92