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Segment Information (Schedule Of Intercompany Sales By Geographic Area) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Intercompany Sales $ 33,765 $ 18,798 $ 67,306 $ 36,469
United States [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 18,085 9,967 36,315 20,478
Germany [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 1,796 833 3,683 2,510
Other Europe [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 13,047 7,156 25,307 11,479
Asia Pacific [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 837 842 2,001 2,002
Intercompany Sales To United States [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 11,709 6,025 22,643 10,799
Intercompany Sales To United States [Member] | Germany [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 446 386 855 704
Intercompany Sales To United States [Member] | Other Europe [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 10,932 5,292 20,975 9,223
Intercompany Sales To United States [Member] | Asia Pacific [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 331 347 813 872
Intercompany Sales To Germany [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 10,458 5,593 22,725 12,039
Intercompany Sales To Germany [Member] | United States [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 9,925 4,658 20,862 10,441
Intercompany Sales To Germany [Member] | Other Europe [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 548 674 1,878 957
Intercompany Sales To Germany [Member] | Asia Pacific [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales (15) 261 (15) 641
Intercompany Sales To Other Europe [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 6,736 5,845 13,493 10,886
Intercompany Sales To Other Europe [Member] | United States [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 4,710 4,234 9,657 7,838
Intercompany Sales To Other Europe [Member] | Germany [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 1,350 447 2,828 1,806
Intercompany Sales To Other Europe [Member] | Other Europe [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 676 1,097 1,008 1,175
Intercompany Sales To Other Europe [Member] | Asia Pacific [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales   67   67
Intercompany Sales To Asia Pacific [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 4,862 1,335 8,445 2,745
Intercompany Sales To Asia Pacific [Member] | United States [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 3,450 1,075 5,796 2,199
Intercompany Sales To Asia Pacific [Member] | Other Europe [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales 891 93 1,446 124
Intercompany Sales To Asia Pacific [Member] | Asia Pacific [Member]
        
Segment Reporting Information [Line Items]        
Intercompany Sales $ 521 $ 167 $ 1,203 $ 422