Asset Retirement Obligation (Tables)

9 Months Ended

Sep. 30, 2018

Asset Retirement Obligation [Abstract]

Summary of reconciliation of the ARO

	Nine Months Ended  September 30,
(in thousands)	2018			2017
Balance at beginning of period	$	7,737		$	5,120
Accretion expense		510			232
Additions from Carbon California Company, LLC		2,921			-
Additions from Seneca Acquisition		639			-
Additions from Liberty Acquisition		30			-
Additions during period		-			5
Obligations on sale of oil & gas properties		-			(93	)
		11,837			5,264
Less: ARO recognized as a current liability		(902	)		(144	)
Balance at end of period	$	10,935		$	5,120