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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                              
Intercompany sales $ 183,363 $ 151,574 $ 170,504 $ 160,722 $ 187,438 $ 166,944 $ 151,512 $ 147,758 $ 154,817 $ 135,717 $ 120,787 $ 102,079 $ 666,163 $ 653,652 $ 513,400
Intercompany Sales To Americas [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         64,589 48,323 30,346
Intercompany Sales To Germany [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         40,788 46,956 25,429
Intercompany Sales To Other EMEA [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         26,855 29,389 21,914
Intercompany Sales To Asia Pacific [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         27,359 19,954 7,435
Intercompany Sales [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         159,591 144,622 85,124
Americas [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         357,976 333,925 284,752
Americas [Member] | Intercompany Sales To Americas [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         3,073 201  
Americas [Member] | Intercompany Sales To Germany [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         36,552 43,841 23,100
Americas [Member] | Intercompany Sales To Other EMEA [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         17,133 20,581 15,622
Americas [Member] | Intercompany Sales To Asia Pacific [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         17,602 14,433 5,438
Americas [Member] | Intercompany Sales [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         74,360 79,056 44,160
Germany [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         82,872 87,021 51,245
Germany [Member] | Intercompany Sales To Americas [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         70 3,217 1,825
Germany [Member] | Intercompany Sales To Other EMEA [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         6,149 6,742 4,135
Germany [Member] | Intercompany Sales To Asia Pacific [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         125 8  
Germany [Member] | Intercompany Sales [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         6,344 9,967 5,960
Other EMEA [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         117,232 109,066 82,536
Other EMEA [Member] | Intercompany Sales To Americas [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         58,419 42,622 26,862
Other EMEA [Member] | Intercompany Sales To Germany [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         4,232 3,115 1,688
Other EMEA [Member] | Intercompany Sales To Other EMEA [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         3,494 2,066 2,090
Other EMEA [Member] | Intercompany Sales To Asia Pacific [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         6,047 2,739 566
Other EMEA [Member] | Intercompany Sales [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         72,192 50,542 31,206
Asia Pacific [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         108,083 123,640 94,867
Asia Pacific [Member] | Intercompany Sales To Americas [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         3,027 2,283 1,659
Asia Pacific [Member] | Intercompany Sales To Germany [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         4   641
Asia Pacific [Member] | Intercompany Sales To Other EMEA [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         79   67
Asia Pacific [Member] | Intercompany Sales To Asia Pacific [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         3,585 2,774 1,431
Asia Pacific [Member] | Intercompany Sales [Member]                              
Segment Reporting Information [Line Items]                              
Intercompany sales                         $ 6,695 $ 5,057 $ 3,798