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Organization And Accounting Policies (Summary Of Liabilities Measured On Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Liabilities | $ 5,175 | $ 146
Fair Value, Inputs, Level 2 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liabilities | 2,064 |
Fair Value, Inputs, Level 3 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liabilities | 3,111 | 146
SARs Liability [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liabilities | 3,111 | 146
SARs Liability [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liabilities | 3,111 | $ 146
Derivative Liability Swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liabilities | 2,064 |
Derivative Liability Swaps [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liabilities | $ 2,064 |

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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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