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Fair Value Measurements - Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Level 1 [Member] | Commodity derivative instruments [Member] |  |
Assets: |  |
Total assets | $ 0 |
Level 2 [Member] | Commodity derivative instruments [Member] |  |
Assets: |  |
Total assets | 25 |
Level 3 [Member] | Commodity derivative instruments [Member] |  |
Assets: |  |
Total assets | 0 |
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total assets | 168 | $ 495
Liabilities: |  |
Total liabilities | 229,817 | 135,567
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] |  |
Assets: |  |
Total assets | 143 | 142
Fair Value, Measurements, Recurring [Member] | Commodity derivative instruments [Member] |  |
Assets: |  |
Total assets | 25 | 353
Liabilities: |  |
Total liabilities | 229,817 | 135,567
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Assets: |  |
Total assets | 143 | 142
Liabilities: |  |
Total liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money market funds [Member] |  |
Assets: |  |
Total assets | 143 | 142
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commodity derivative instruments [Member] |  |
Assets: |  |
Total assets |  | 0
Liabilities: |  |
Total liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Assets: |  |
Total assets | 25 | 353
Liabilities: |  |
Total liabilities | 229,817 | 135,567
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Money market funds [Member] |  |
Assets: |  |
Total assets | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commodity derivative instruments [Member] |  |
Assets: |  |
Total assets |  | 353
Liabilities: |  |
Total liabilities | 229,817 | 135,567
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Assets: |  |
Total assets | 0 | 0
Liabilities: |  |
Total liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Money market funds [Member] |  |
Assets: |  |
Total assets | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commodity derivative instruments [Member] |  |
Assets: |  |
Total assets |  | 0
Liabilities: |  |
Total liabilities | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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