Long-Term Debt and Notes Payable - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Sep. 02, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Oct. 20, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Cross default provision, threshold amount		$ 10,000,000		$ 10,000,000
Initial borrowing base		$ 1,600,000,000		$ 1,600,000,000			$ 2,000,000,000
Loan limit percentage (less than)		10.00%		10.00%
Credit facility cross default provision, threshold amount		$ 75,000,000		$ 75,000,000
Interest expense		10,084,000	$ 11,522,000	33,086,000	$ 27,374,000
Capitalized interest expense		$ 0	$ 0	$ 32,000	$ 37,000
Commitment fee (basis points)				0.30%
Syndicated Credit Facility | Credit Facility, September 2, 2014
Debt Instrument [Line Items]
Term of credit facility	5 years
Debt covenant, debt to EBITDAX ratio		4.0		4.0
Debt covenant, current assets to current liabilities ratio		1.0		1.0
Debt covenant, minimum net present value of proved reserves to consolidated debt, ratio		1.50		1.50
Subsequent Event | Syndicated Credit Facility | Credit Facility, September 2, 2014
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 1,400,000,000