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Other Comprehensive Income (Loss) (Schedule Of Tax Effects Of The Components Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Other Comprehensive Income (Loss) [Abstract] |  |
Defined benefit pension plan adjustments, Before-Tax Amount | $ 455 | $ 427
Defined benefit pension plan adjustments, Tax (Expense) Benefit | (187) | (180)
Defined benefit pension plan adjustments, Net-of-Tax Amount | 268 | 247
Foreign currency translation adjustments, Before-Tax Amount | (92) | 1,604
Foreign currency translation adjustments, Tax (Expense) Benefit | 38 | (674)
Foreign currency translation adjustments, Net-of-Tax Amount | (54) | 930
Unrealized (loss) gain in fair value of investments, Before-Tax Amount | (36) | 13
Unrealized (loss) gain in fair value of investments, Tax (Expense) Benefit | 15 | (5)
Unrealized (loss) gain in fair value of investments, Net-of-Tax Amount | (21) | 8
Unrealized loss in fair value of interest rate swap, Before-Tax Amount |  | (62)
Unrealized loss in fair value of interest rate swap, Tax (Expense) Benefit |  | 27
Unrealized loss in fair value of interest rate swap, Net-of-Tax Amount |  | (35)
Total other comprehensive income, Before-Tax Amount | 327 | 1,982
Total other comprehensive income, Tax (Expense) Benefit | (134) | (832)
Total other comprehensive income, net of tax | $ 193 | $ 1,150

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