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Accumulated Other Comprehensive Income (Loss) (Schedule Of Accumulated Other Comprehensive Income (Loss) By Component) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 615,948 | $ 626,700
Other comprehensive income (loss) | (18,843) | 31,689
Amounts reclassified from accumulated other comprehensive income | 1,401 |
Ending balance | 575,987 | 615,948
Foreign currency translation adjustment |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (19,319) | (50,738)
Other comprehensive income (loss) | (18,751) | 31,419
Amounts reclassified from accumulated other comprehensive income | 1,401 |
Ending balance | (36,669) | (19,319)
Defined benefit pension plan |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (2,555) | (2,775)
Other comprehensive income (loss) | (92) | 220
Amounts reclassified from accumulated other comprehensive income | 0 |
Ending balance | (2,647) | (2,555)
Liquidation of non-US entity and purchase of non-controlling interests |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 338 | 288
Other comprehensive income (loss) | 0 | 50
Amounts reclassified from accumulated other comprehensive income | 0 |
Ending balance | 338 | 338
Accumulated Other Comprehensive (Loss) Income |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (21,536) | (53,225)
Ending balance | $ (38,978) | $ (21,536)

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