Commitments and Contingencies (Details) $ in Thousands			3 Months Ended	6 Months Ended	12 Months Ended
	Feb. 09, 2016 complaint company	Mar. 11, 1997	Jun. 30, 2016 USD ($) well	Jun. 30, 2016 USD ($) well	Dec. 31, 1997 USD ($) well	Dec. 31, 2015 USD ($)
Commitments [Line Items]
Loss Contingency, New Claims Filed, Number | complaint	2
Plugging and abandonment escrow account on the WCBB properties (Note 10)			$ 3,081	$ 3,081		$ 3,089
WCBB
Commitments [Line Items]
Purchasing remaining percent interest In oil and gas property, percent					50.00%
Payments held for restricted cash					$ 18
Significant plugging commitment minimum number of wells to be plugged | well					20
Tenure of minimum wells to be plugged		20 years
Number of wells plugged | well			463	463
Muskie Proppant LLC
Commitments [Line Items]
Long-term purchase commitment, accrued damages , amount			$ 700	$ 2,000
Cameron Parish
Commitments [Line Items]
Loss Contingency, Number of Defendant Companies in a Complaint | company	26
Vermillion Parish
Commitments [Line Items]
Loss Contingency, Number of Defendant Companies in a Complaint | company	9