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Equity and Share-Based Compensation (Details 4) (USD $)	3 Months Ended		6 Months Ended
Equity and Share-Based Compensation (Details 4) (USD $)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation, Post-Initial Public Offering
Total share-based compensation expense, net of amounts capitalizes to oil and gas properties	$ 1,770,000	$ 682,000	$ 3,014,000	$ 682,000
Capitalized qualifying share-based compensation costs to oil and gas properties	400,000		600,000
2012 LTIP \| Restricted stock awards
Share-based Compensation, Post-Initial Public Offering
Total share-based compensation expense, net of amounts capitalizes to oil and gas properties	$ 1,770,000	$ 682,000	$ 3,014,000	$ 682,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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