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Commodity Price Risk Derivatives - Schedule of Relaized and Unrealized Derivative Gains and Losses (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Realized gains and (losses) |  | $ (179) |
Unrealized gains and (losses) |  | 54 | [1]
Oil [Member] |  |  |
Realized gains and (losses) |  | (186) |
Unrealized gains and (losses) |  | 68 |
Natural Gas [Member] |  |  |
Realized gains and (losses) |  | 7 |
Unrealized gains and (losses) |  | $ (14) |
[1] | The condensed consolidated statement of cash flows for the three months ended March 31, 2018 was restated to include the loss due to the change in the fair value of marketable equity securities of $78 thousand in net loss. The amount was originally included in other comprehensive loss.

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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Details
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- Details
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