Segment Information (Schedule Of Long-Lived Assets By Geographic Area) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Long-lived assets	$ 416,203	$ 459,492	$ 949,620
Americas [Member]
Segment Reporting Information [Line Items]
Long-lived assets	96,016	113,364	570,049
Germany [Member]
Segment Reporting Information [Line Items]
Long-lived assets	14,757	14,088	19,994
Other EMEA [Member]
Segment Reporting Information [Line Items]
Long-lived assets	247,786	271,892	312,384
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 57,644	$ 60,148	$ 47,193