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Commitments And Contingencies (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) $ / bbl | Sep. 30, 2012 USD ($)
Loss Contingencies [Line Items] |  |
Decrease in compensation | $ 395,000 |
Period of trailing average of WTI | 30 days |
Incidence Of Non-Compliance [Member] |  |
Loss Contingencies [Line Items] |  |
Maximum potential loss |  | $ 386,000
Litigation [Member] |  |
Loss Contingencies [Line Items] |  |
Requested recovery amount | $ 188,000 |
Minimum [Member] |  |
Loss Contingencies [Line Items] |  |
Compensation reduction until WTI posting | $ / bbl | 70 |
Compensation reimbursement at WTI posting | $ / bbl | 85 |

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