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Restructuring Charges (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) number_of_employees | Dec. 31, 2016 USD ($) number_of_employees | Dec. 31, 2015 USD ($) number_of_employees
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees | 163 | 582 | 672
2017 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs | $ 2,172 |  |
Other exit costs | 531 |  |
Facility lease obligations | $ 264 |  |
2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  | $ 3,630 |
Other exit costs |  | $ 977 |
2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  |  | $ 2,542
Other exit costs |  |  | 3,301
Facility lease obligations |  |  | $ 2,462
Americas [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees | 160 | 370 | 223
Americas [Member] | 2017 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs | $ 1,985 |  |
Other exit costs | 531 |  |
Facility lease obligations | $ 264 |  |
Americas [Member] | 2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  | $ 1,726 |
Other exit costs |  | $ 924 |
Americas [Member] | 2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  |  | $ 1,564
Other exit costs |  |  | 3,099
Facility lease obligations |  |  | $ 2,462
Asia [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees | 3 | 212 | 438
Asia [Member] | 2017 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs | $ 187 |  |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees | 3 |  |
Other exit costs | $ 0 |  |
Facility lease obligations | $ 0 |  |
Asia [Member] | 2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  | $ 1,904 |
Other exit costs |  | 0 |
Asia [Member] | 2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  |  | $ 506
Other exit costs |  |  | 0
Facility lease obligations |  |  | $ 0
Europe [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees |  |  | 11
Europe [Member] | 2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  | 0 |
Other exit costs |  | $ 53 |
Europe [Member] | 2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  |  | $ 472
Other exit costs |  |  | 202
Facility lease obligations |  |  | $ 0

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