Commitments And Contingencies (Narrative) (Details)	6 Months Ended	42 Months Ended
	Jun. 30, 2018 USD ($) $ / bbl	Jun. 30, 2018 USD ($)	Sep. 30, 2012 USD ($)
Loss Contingencies [Line Items]
Decrease in compensation		$ 451,000
Period of trailing average of WTI	30 days
Drilling commitment	$ 280,000	$ 280,000
Incidence Of Non-Compliance [Member]
Loss Contingencies [Line Items]
Maximum potential loss			$ 386,000
Minimum [Member]
Loss Contingencies [Line Items]
Compensation reduction until WTI posting | $ / bbl	70
Compensation reimbursement at WTI posting | $ / bbl	85