Long-Term Debt - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Sep. 02, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Apr. 13, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Cross default provision, threshold amount		$ 10,000,000		$ 10,000,000
Initial borrowing base		$ 1,050,000,000		$ 1,050,000,000			$ 1,400,000,000
Loan limit percentage (less than)		10.00%		10.00%
Credit facility cross default provision, threshold amount		$ 75,000,000		$ 75,000,000
Interest expense		8,987,000	$ 10,084,000	27,858,000	$ 33,086,000
Debt issuance costs related to long-term debt		800,000	800,000	2,500,000	2,500,000
Capitalized interest expense		100,000	0	$ 100,000	0
Commitment fee (basis points)				0.30%
Debt related commitment fees		800,000	$ 1,100,000	$ 2,600,000	$ 3,100,000
Credit facility
Debt Instrument [Line Items]
Initial borrowing base		$ 1,050,000,000		$ 1,050,000,000		$ 1,050,000,000
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