FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Nonrecurring Measurements

	December 31, 2019						December 31, 2018
(in thousands)	Carrying Value Before Assessment		Estimated Fair Value		Impairment		Carrying Value Before Assessment		Estimated Fair Value		Impairment
Unproved oil and gas properties	$	31,023	$	—	$	31,023	$	816,282	$	74,217	$	742,065
Proved oil and gas properties	700,182		215,352		484,830		1,895,670		604,023		1,291,647
Operating lease right-of-use assets	13,514		—		13,514		—		—		—
Other long-term assets(1)	51,518		24,189		27,329		—		—		—
Equity method investment	—		—		—		17,063		1,100		15,963
Midstream property and equipment(1)	432,415		83,818		348,597		474,529		406,122		68,407
Intangible assets	—		—		—		394,999		—		394,999
Goodwill	—		—		—		691,970		—		691,970
Total	$	1,228,652	$	323,359	$	905,293	$	4,290,513	$	1,085,462	$	3,205,051

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(1) Amounts reflect only those assets that were impaired.