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Summary Of Significant Accounting Policies (Effect of the Adoption of ASC 2014-09 on Financial Statements) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred income taxes | $ 24,834 | $ 24,747 | $ 24,908
Deferred current revenue | 8,276 | 9,496 | 9,850
Retained earnings | $ 35,920 | $ 32,873 | 32,679
Previously Reported [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred income taxes |  |  | 24,908
Deferred current revenue |  |  | 9,850
Retained earnings |  |  | 32,679
Adjustments Due To ASU 2014-09 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred income taxes |  |  | (161)
Deferred current revenue |  |  | (354)
Retained earnings |  |  | $ 194

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