Segment Information (Schedule Of Intercompany Sales By Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Intercompany sales	$ 152,555	$ 160,722
Intercompany Sales To Americas [Member]
Segment Reporting Information [Line Items]
Intercompany sales	15,122	16,021
Intercompany Sales To Germany [Member]
Segment Reporting Information [Line Items]
Intercompany sales	7,034	10,788
Intercompany Sales To Other EMEA [Member]
Segment Reporting Information [Line Items]
Intercompany sales	4,600	7,518
Intercompany Sales To Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany sales	5,008	6,377
Intercompany Sales [Member]
Segment Reporting Information [Line Items]
Intercompany sales	31,764	40,704
Americas [Member] | Intercompany Sales To Americas [Member]
Segment Reporting Information [Line Items]
Intercompany sales	289	480
Americas [Member] | Intercompany Sales To Germany [Member]
Segment Reporting Information [Line Items]
Intercompany sales	6,201	10,134
Americas [Member] | Intercompany Sales To Other EMEA [Member]
Segment Reporting Information [Line Items]
Intercompany sales	3,265	5,837
Americas [Member] | Intercompany Sales To Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany sales	2,956	4,973
Americas [Member] | Intercompany Sales [Member]
Segment Reporting Information [Line Items]
Intercompany sales	12,711	21,424
Germany [Member] | Intercompany Sales To Americas [Member]
Segment Reporting Information [Line Items]
Intercompany sales	634
Germany [Member] | Intercompany Sales To Other EMEA [Member]
Segment Reporting Information [Line Items]
Intercompany sales	451	804
Germany [Member] | Intercompany Sales [Member]
Segment Reporting Information [Line Items]
Intercompany sales	1,085	804
Other EMEA [Member] | Intercompany Sales To Americas [Member]
Segment Reporting Information [Line Items]
Intercompany sales	13,169	14,915
Other EMEA [Member] | Intercompany Sales To Germany [Member]
Segment Reporting Information [Line Items]
Intercompany sales	833	654
Other EMEA [Member] | Intercompany Sales To Other EMEA [Member]
Segment Reporting Information [Line Items]
Intercompany sales	881	864
Other EMEA [Member] | Intercompany Sales To Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany sales	1,161	646
Other EMEA [Member] | Intercompany Sales [Member]
Segment Reporting Information [Line Items]
Intercompany sales	16,044	17,079
Asia Pacific [Member] | Intercompany Sales To Americas [Member]
Segment Reporting Information [Line Items]
Intercompany sales	1,030	626
Asia Pacific [Member] | Intercompany Sales To Other EMEA [Member]
Segment Reporting Information [Line Items]
Intercompany sales	3	13
Asia Pacific [Member] | Intercompany Sales To Asia Pacific [Member]
Segment Reporting Information [Line Items]
Intercompany sales	891	758
Asia Pacific [Member] | Intercompany Sales [Member]
Segment Reporting Information [Line Items]
Intercompany sales	$ 1,924	$ 1,397