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Other Comprehensive Income (Loss) (Schedule Of Items Reclassified Out Of AOCI And The Corresponding Location And Impact On The Condensed Consolidated Statements Of Operations) (Details) - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Defined benefit pension plan adjustments | $ 456 | $ 427 | $ 1,368 | $ 1,280
Income tax benefit | (187) | (179) | (562) | (461)
Net of tax | $ 269 | $ 248 | $ 806 | $ 819

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