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OPERATING REVENUES - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	$ 50,563	$ 61,245	$ 158,360	$ 165,652
Other	246	350	743	613
Total operating revenues	50,809	61,595	159,103	166,265
Oil
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	46,275	53,918	145,024	145,743
Natural gas
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	301	1,407	107	5,286
Natural gas liquids
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	3,987	$ 5,920	13,229	$ 14,623
Accounts receivable
Disaggregation of operating revenue
Due from contracts with customers	$ 26,600		$ 26,600		$ 26,400

X

- Definition

The total amount of other operating income, including adjustments, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 606
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-Section 50
-Paragraph 4
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 280
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