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Liquidity And Going Concern (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 14, 2016 USD ($) | Dec. 31, 2015 USD ($) $ / Boe | Sep. 30, 2015 USD ($) | [1] | Jun. 30, 2015 USD ($) | [1] | Mar. 31, 2015 USD ($) | [1] | Dec. 31, 2014 USD ($) | [1] | Sep. 30, 2014 USD ($) | [1] | Jun. 30, 2014 USD ($) $ / Boe | Mar. 31, 2014 USD ($) | [1] | Dec. 31, 2015 USD ($) $ / Boe | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Liquidity And Going Concern [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas sales |  | $ 17,523 | [1] | $ 17,546 | $ 27,137 | $ 18,239 | $ 23,037 | $ 24,486 | $ 52,098 | [1] | $ 28,071 | $ 80,445 | $ 127,691 | $ 169,277
Borrowings under credit facility |  | 15,000 |  |  |  |  |  |  |  |  |  | 15,000 |  |
Credit facility borrowing base |  | $ 20,100 |  |  |  |  |  |  |  |  |  | $ 20,100 |  |
Energy Related Derivative [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity And Going Concern [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Crude oil, average price per Barrel | $ / Boe |  | 33.56 |  |  |  |  |  |  | 103.23 |  |  | 33.56 |  |
Sonangol P&P [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity And Going Concern [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint interest owner payments | $ 19,000 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | As discussed in Note 3 to the consolidated financial statements an error was identified the prepaid royalty account that caused previous periods to be misstated. Total revenues were corrected through an out of period adjustment in the fourth quarter of 2015 with reduction of $2.3 million, overstating operating loss and net loss by $2.3 million.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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