Long-Term Debt (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Outstanding debt under reserve-based credit facility	$ 151,322,000	$ 104,909,000
Unamortized debt issue costs	1,700,000	2,100,000
Amortization of debt issuance costs	507,000	$ 1,338,000
Credit Agreement
Line of Credit Facility [Line Items]
Maximum borrowing capacity	500,000,000
Initial borrowing capacity	200,000,000
Sub-limit which may be used for issuance of letters of credit	$ 15,000,000
Commitment fee on unutilized borrowing base	0.50%
Credit Agreement | Scenario Two
Line of Credit Facility [Line Items]
Debt to Adjusted EBITDA ratio	4.0
Minimum | Credit Agreement
Line of Credit Facility [Line Items]
Consolidated current asset ratio	1.0
Required interest coverage ratio	2.5
Ownership percentage by subsidiary	50
Exceeding of reserve-based credit facility over borrowing base (as a percent)	90.00%
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 | Scenario One
Line of Credit Facility [Line Items]
Debt to Adjusted EBITDA ratio	4.5
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%
Western Catarina Midstream | Credit Agreement | Scenario One
Line of Credit Facility [Line Items]
Debt to Adjusted EBITDA ratio	5.0
Western Catarina Midstream | Credit Agreement | Scenario Two
Line of Credit Facility [Line Items]
Debt to Adjusted EBITDA ratio	4.75
Western Catarina Midstream | Credit Agreement | Scenario Three
Line of Credit Facility [Line Items]
Debt to Adjusted EBITDA ratio	4.5