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Restructuring Charges (Schedule Of Components Of Restructuring Charges) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | $ 4,936 | $ 4,693 |
2017 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs | 2,172 |  |
Facility lease costs | 264 |  |
Other exit costs | 531 |  |
Total restructuring charges | 2,967 |  |
2017 [Member] | Americas [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs | 1,985 |  |
Facility lease costs | 264 |  |
Other exit costs | 531 |  |
Total restructuring charges | 2,780 |  |
2017 [Member] | Asia [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs | 187 |  |
Facility lease costs | 0 |  |
Other exit costs | 0 |  |
Total restructuring charges | 187 |  |
2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  | 3,630 |
Other exit costs |  | 977 |
Total restructuring charges | $ 1,969 | 4,607 |
2016 [Member] | Americas [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  | 1,726 |
Other exit costs |  | 924 |
Total restructuring charges |  | 2,650 |
2016 [Member] | Europe [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  | 0 |
Other exit costs |  | 53 |
Total restructuring charges |  | 53 |
2016 [Member] | Asia [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  | 1,904 |
Other exit costs |  | 0 |
Total restructuring charges |  | 1,904 |
2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  |  | $ 2,542
Facility lease costs |  |  | 2,462
Other exit costs |  |  | 3,301
Total restructuring charges |  | $ 86 | 8,305
2015 [Member] | Americas [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  |  | 1,564
Facility lease costs |  |  | 2,462
Other exit costs |  |  | 3,099
Total restructuring charges |  |  | 7,125
2015 [Member] | Europe [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  |  | 472
Facility lease costs |  |  | 0
Other exit costs |  |  | 202
Total restructuring charges |  |  | 674
2015 [Member] | Asia [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance costs |  |  | 506
Facility lease costs |  |  | 0
Other exit costs |  |  | 0
Total restructuring charges |  |  | $ 506

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