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Restructuring Charges (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) number_of_employees | Dec. 31, 2015 USD ($) number_of_employees | Dec. 31, 2014 USD ($) number_of_employees
2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs | $ 3,630 |  |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees | 582 |  |
Other exit costs | $ 977 |  |
2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  | $ 2,542 |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees |  | 672 |
Other exit costs |  | $ 3,301 |
Facility lease obligations |  | 2,462 |
2014 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  |  | $ 876
Number of employees reduced in connection with workforce of certain facilities | number_of_employees |  |  | 104
Other exit costs |  |  | $ 3
Americas [Member] | 2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs | $ 1,726 |  |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees | 370 |  |
Other exit costs | $ 924 |  |
Americas [Member] | 2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  | $ 1,564 |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees |  | 223 |
Other exit costs |  | $ 3,099 |
Facility lease obligations |  | 2,462 |
Americas [Member] | 2014 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  |  | $ 827
Number of employees reduced in connection with workforce of certain facilities | number_of_employees |  |  | 104
Other exit costs |  |  | $ 0
Asia [Member] | 2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs | $ 1,904 |  |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees | 212 |  |
Other exit costs | $ 0 |  |
Asia [Member] | 2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  | $ 506 |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees |  | 438 |
Other exit costs |  | $ 0 |
Facility lease obligations |  | 0 |
Asia [Member] | 2014 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee termination costs |  |  | 49
Other exit costs |  |  | $ 3
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 |
Number of employees reduced in connection with workforce of certain facilities | number_of_employees |  | 11 |
Other exit costs |  | $ 202 |
Facility lease obligations |  | $ 0 |

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