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Summary Of Significant Accounting Policies (Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset commodity swap | $ 3,520 |
Assets | 3,520 |
SARs liability | 1,632 | $ 146
Liabilities | 1,632 | 146
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset commodity swap |  |
Assets |  |
SARs liability |  |
Liabilities |  |
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset commodity swap | 3,520 |
Assets | 3,520 |
SARs liability | 1,632 | 146
Liabilities | 1,632 | 146
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset commodity swap |  |
Assets |  |
SARs liability |  |
Liabilities |  |

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