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Segment Information (Schedule Of Intercompany Sales By Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Intercompany sales	$ 177,264	$ 152,907	$ 159,467	$ 156,431	$ 165,937	$ 156,362	$ 158,111	$ 152,555	$ 183,363	$ 151,574	$ 170,504	$ 160,722	$ 646,069	$ 632,965	$ 666,163
Intercompany Sales [Member]
Intercompany sales													175,898	155,451	159,591
Americas [Member] | Intercompany Sales [Member]
Intercompany sales													75,668	71,268	64,589
Germany [Member] | Intercompany Sales [Member]
Intercompany sales													42,919	32,246	40,788
Other EMEA [Member] | Intercompany Sales [Member]
Intercompany sales													28,042	20,248	26,855
Asia Pacific [Member] | Intercompany Sales [Member]
Intercompany sales													29,269	31,689	27,359
Americas [Member] | Intercompany Sales [Member]
Intercompany sales													74,246	64,491	74,360
Americas [Member] | Americas [Member] | Operating Segments [Member]
Intercompany sales													2,169	3,013	3,073
Americas [Member] | Germany [Member] | Operating Segments [Member]
Intercompany sales													36,914	28,881	36,552
Americas [Member] | Other EMEA [Member] | Operating Segments [Member]
Intercompany sales													14,775	10,958	17,133
Americas [Member] | Asia Pacific [Member] | Operating Segments [Member]
Intercompany sales													20,388	21,639	17,602
EMEA [Member] | Operating Segments [Member]
Intercompany sales													220,357	193,141	200,104
EMEA [Member] | Intercompany Sales [Member]
Intercompany sales													94,752	83,586	78,536
EMEA [Member] | Americas [Member] | Operating Segments [Member]
Intercompany sales													70,709	65,209	58,489
EMEA [Member] | Germany [Member] | Operating Segments [Member]
Intercompany sales													6,005	3,365	4,232
EMEA [Member] | Other EMEA [Member] | Operating Segments [Member]
Intercompany sales													13,093	8,921	9,643
EMEA [Member] | Asia Pacific [Member] | Operating Segments [Member]
Intercompany sales													4,945	6,091	6,172
Asia Pacific [Member] | Operating Segments [Member]
Intercompany sales													91,936	98,939	108,083
Asia Pacific [Member] | Intercompany Sales [Member]
Intercompany sales													6,900	7,374	6,695
Asia Pacific [Member] | Americas [Member] | Operating Segments [Member]
Intercompany sales													2,790	3,046	3,027
Asia Pacific [Member] | Germany [Member] | Operating Segments [Member]
Intercompany sales															4
Asia Pacific [Member] | Other EMEA [Member] | Operating Segments [Member]
Intercompany sales													174	369	79
Asia Pacific [Member] | Asia Pacific [Member] | Operating Segments [Member]
Intercompany sales													$ 3,936	$ 3,959	$ 3,585

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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