Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Summary of Significant Accounting Policies [Abstract]
Balance at beginning of year	$ 7,357	$ 5,120
Accretion expense	868	307
Change in estimate of cash outflow	361	2,402
Additions from Carbon California (Note 4)	2,921
Additions from Seneca Acquisition (Note 4)	5,132
Additions from Liberty Acquisition (Note 4)	45
Additions from OIE Membership Acquisition	5,626
Less: sale of wells		(92)
Reconciliation of ARO, Gross	22,310	7,737
Less: ARO recognized as accounts payable and accrued liabilities	(3,099)	(380)
Balance at end of year	$ 19,211	$ 7,357