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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 |  |  |  |  |

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