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It represent profits of interest

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With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information.

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Description of restructuring activities for an acquired entity, including the amount of acquisition costs allocated to restructuring activities, and the period in which such costs will be incurred. The type of major actions that comprise the plan to exit an activity or involuntarily terminate employees of the acquired entity including activities of the acquired entity that will not continue, method of disposition, and description of employee groups that will be terminated. If the entity has not finalized plans for the restructuring activities, a description of the unresolved issues, the types of additional liabilities that might arise, and how any adjustment would be reported in the financial statements. Disclosure may also include timeframe when the registrant began formulating exit plans for which accrual may be necessary, and the types and amounts of liabilities included in the acquisition cost allocation. Disclosure may include the nature and amount of losses relating to asset impairments from the exit or disposal activity.

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In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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Amount of assets acquired at the acquisition date.

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Acquisitions and Divestitures (Details Textual) $ in Thousands				1 Months Ended	9 Months Ended
	Jul. 11, 2018	May 01, 2018	Feb. 01, 2018	Oct. 31, 2017 USD ($) Acres	Sep. 30, 2018 USD ($)	Feb. 15, 2017 USD ($)
Acquisitions and Divestitures (Textual)
Purchase price of acquired assets					$ 38,331
Carbon California [Member]
Acquisitions and Divestitures (Textual)
Profits interest		53.90%	38.59%
Recognized gain based on fair value					$ 5,400
Qualifies as a business combination, description			We recognized 100% of the identifiable assets acquired, liabilities assumed and the non-controlling interest at their respective fair value as of the date of the acquisition. We exchanged 1,527,778 common shares at a fair value of approximately $8.3 million ($5.45 per share), for 11,000 Class A Units of Carbon California, representing a 38.59% profits ownership interest in Carbon California.
Percentage of profits interest			56.40%			17.81%
Acquisitions issuance shares, description			On February 1, 2018, Yorktown exercised the California Warrant resulting in the issuance of 1,527,778 shares of our common stock in exchange for Yorktown’s Class A Units of Carbon California representing approximately 46.96% of the outstanding Class A Units of Carbon California (a profits interest of approximately 38.59%). After giving effect to the exercise on February 1, 2018, we owned 56.4% of the voting and profits interests of Carbon California.
Percentage of voting and profits interest		46.10%
Purchase Agreement [Member]
Acquisitions and Divestitures (Textual)
Purchase price of acquired assets						$ 1,500
Seneca Acquisition [Member]
Acquisitions and Divestitures (Textual)
Transaction and due diligence costs				$ 318
Non-operated oil wells covering, gross acres \| Acres				5,700
Non-operated oil wells covering, net \| Acres				5,500
Purchase price				$ 43,000
Description of seneca acquisition				We contributed approximately $5.0 million to Carbon California to fund our portion of the purchase price, through the $5.0 Preferred Stock issuance. Prudential also contributed $5.0 million to fund its share of the equity portion of the purchase price. Carbon California funded the remaining purchase price from cash, increased borrowings under the Senior Revolving Notes and $3.0 million in proceeds from the issuance of Senior Subordinated Notes.
Assumed liabilities				$ 330
ARO [Member] \| Seneca Acquisition [Member]
Acquisitions and Divestitures (Textual)
Assumed liabilities				$ 639
Liberty Energy, LLC [Member]
Acquisitions and Divestitures (Textual)
Description of liberty acquisition	We completed an acquisition of 54 operated oil and gas wells covering approximately 55,000 gross acres (22,000 net) and the associated mineral interests in the Appalachian Basin for a purchase price of $3.0 million, subject to customary and standard purchase price adjustments (the "Liberty Acquisition"). The Liberty Acquisition increased our ownership in the acquired wells from 60% to 100%. The Liberty Acquisition was funded through borrowings under our Credit Facility. The Liberty Acquisition is accounted for as a non-significant asset acquisition.