Long-Term Debt (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	May 19, 2016 USD ($)
Line of Credit Facility [Line Items]
Amortization of debt issuance costs	$ 377	$ 413
Unamortized debt issue costs	1,800		$ 2,100
Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity	500,000
Sub-limit which may be used for issuance of letters of credit	$ 15,000
Borrowing base amount				$ 200,000
Exceeding of reserve-based credit facility over borrowing base (as a percent)	90.00%
Credit Agreement | Second full quarter after Catarina acquisition
Line of Credit Facility [Line Items]
Borrowing base multiplier	4.75
Credit Agreement | Thereafter
Line of Credit Facility [Line Items]
Borrowing base multiplier	4.5
Minimum | Credit Agreement
Line of Credit Facility [Line Items]
Consolidated current asset ratio	1.0
Required interest coverage ratio	2.5
Minimum | Credit Agreement | Scenario One
Line of Credit Facility [Line Items]
Debt to Adjusted EBITDA ratio	4.5
Minimum | Credit Agreement | Scenario Two
Line of Credit Facility [Line Items]
Debt to Adjusted EBITDA ratio	4.0
Minimum | Credit Agreement | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Variable interest rate	2.25%
Minimum | Credit Agreement | ABR
Line of Credit Facility [Line Items]
Variable interest rate	1.25%
Maximum | Credit Agreement
Line of Credit Facility [Line Items]
Commitment fee on unutilized borrowing base	0.50%
Maximum | Credit Agreement | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Variable interest rate	3.25%
Maximum | Credit Agreement | ABR
Line of Credit Facility [Line Items]
Variable interest rate	2.25%
Accounting Standards Update 2015-03 | Scenario, Adjustment
Line of Credit Facility [Line Items]
Long term debt, net of debt issuance costs			(2,091)
Amortization of debt issuance costs			$ (2,091)