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OPERATING REVENUES - Adoption of ASC 606, Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating revenues
Gathering and other expense	$ (18,404)	$ (10,886)	$ (30,782)	$ (34,640)
Adjustments due to ASU 201409 | ASU 201409
Operating revenues
Cumulative effect of applying ASC 606			0
Oil, natural gas and natural gas liquids sales	200		600
Gathering and other expense	$ 200		$ 600

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- Definition

Represents the amount of gathering and transportation expenses incurred by the entity and other expenses not separately reflected on the income statement for the period.

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- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

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-Name Accounting Standards Codification
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-Section 50
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