Long-Term Debt And Lease Liabilities (Components Of Lease Cost) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lease Cost [Line Items]
Total operating lease cost	$ 15
Amortization of right of use assets	21
Interest on lease liabilities	1
Total finance lease cost	22
Production Costs And Taxes [Member]
Lease Cost [Line Items]
Total operating lease cost	3
General and Administrative Expense [Member]
Lease Cost [Line Items]
Total operating lease cost	$ 12