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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 615,948
Ending Balance	587,833
Foreign currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(19,319)
Other comprehensive income (loss)	(11,489)
Ending Balance	(30,808)
Defined benefit pension plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,555)
Other comprehensive income (loss)	147
Ending Balance	(2,408)
Liquidation of non-US entity and purchase of non-controlling interests
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	338
Other comprehensive income (loss)	0
Ending Balance	338
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(21,536)
Other comprehensive income (loss)	(11,342)
Ending Balance	$ (32,878)

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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- Definition

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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