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Summary Of Significant Accounting Policies (Effect Of The Adoption Of ASC 2014-09 On Financial Statements) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred income taxes | $ 26,235 | $ 24,585 | $ 24,746
Deferred current revenue | 9,264 | 9,495 | 9,850
Retained earnings | $ 47,616 | $ 33,250 | 33,056
As Reported [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred income taxes |  |  | 24,908
Retained earnings |  |  | 32,679
Adjustments [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred income taxes |  |  | (162)
Retained earnings |  |  | 377
Adjustments [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred income taxes |  |  | (161)
Deferred current revenue |  |  | (355)
Retained earnings |  |  | $ 194

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