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OPERATING REVENUES - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	$ 55,874	$ 55,307	$ 107,797	$ 104,407
Other	504	108	497	263
Total operating revenues	56,378	55,415	108,294	104,670
Oil
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	53,232	48,756	98,749	91,825
Natural gas
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	(1,655)	1,560	(194)	3,879
Natural gas liquids
Disaggregation of operating revenue
Total oil, natural gas and natural gas liquids sales	4,297	$ 4,991	9,242	$ 8,703
Accounts receivable
Disaggregation of operating revenue
Due from contracts with customers	$ 25,200		$ 25,200		$ 26,400

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- 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
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-Topic 606
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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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-Section 50
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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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