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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 615,948
Ending Balance	578,195
Foreign currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(19,319)
Other comprehensive income (loss)	(14,491)
Amounts reclassified from accumulated other comprehensive loss	1,401
Ending Balance	(32,409)
Defined benefit pension plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,555)
Other comprehensive income (loss)	204
Amounts reclassified from accumulated other comprehensive loss	0
Ending Balance	(2,351)
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
Amounts reclassified from accumulated other comprehensive 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)	(14,287)
Amounts reclassified from accumulated other comprehensive loss	1,401
Ending Balance	$ (34,422)

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- Definition

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

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

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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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