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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets (Liabilities) |  |
Derivative Liability | $ 24,954 | $ 0
Fair value on a recurring basis [Member] |  |
Assets (Liabilities) |  |
Derivative Liability | (24,954) | 16,284
Derivative, Fair Value, Net | (24,954) |
Fair value on a recurring basis [Member] | Oil [Member] |  |
Assets (Liabilities) |  |
Derivative Assets (Liabilities), at Fair Value, Net |  | 16,284
Fair value on a recurring basis [Member] | Level 1 [Member] |  |
Assets (Liabilities) |  |
Derivative Liability | 0 | 0
Fair value on a recurring basis [Member] | Level 2 [Member] |  |
Assets (Liabilities) |  |
Derivative Liability | (24,954) | 16,284
Derivative, Fair Value, Net |  | 16,284
Fair value on a recurring basis [Member] | Level 3 [Member] |  |
Assets (Liabilities) |  |
Derivative Liability | $ 0 | $ 0

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 + Details
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