ASSET IMPAIRMENT (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Impairment of Long-Lived Assets Held and Used by Asset

Impairments recognized by Energen are presented below:

Years ended December 31, (in thousands)	2017		2016		2015
Permian Basin properties
Central Basin Platform	$	1,096	$	187,043	$	484,848
Delaware Basin	—		21,288		607,303
Midland Basin	—		—		—
San Juan Basin properties	—		7,519		133,055
Permian Basin unproved leasehold properties	575		4,762		29,168
San Juan Basin unproved leasehold properties	—		40		37,934
Total asset impairments	$	1,671	$	220,652	$	1,292,308