Restructuring Costs Restructuring Costs (Narrative) (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
[1] | Sep. 30, 2017 |
[1] | Jul. 01, 2017 |
[1] | Apr. 01, 2017 |
[1] | Dec. 31, 2016 |
[1] | Oct. 01, 2016 |
[1] | Jul. 02, 2016 |
[1] | Apr. 02, 2016 |
[1] | Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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Restructuring Cost and Reserve [Line Items] | |||||||||||||||||||||
Restructuring costs | $ 752 | $ 423 | $ 315 | $ 554 | $ 271 | $ 709 | $ 1,011 | $ 675 | $ 2,044 | $ 2,666 | $ 4,461 | ||||||||||
Employee Severance | |||||||||||||||||||||
Restructuring Cost and Reserve [Line Items] | |||||||||||||||||||||
Restructuring costs | 2,044 | 2,666 | $ 4,461 | ||||||||||||||||||
Global Cost Reduction Program | Costa Rica | |||||||||||||||||||||
Restructuring Cost and Reserve [Line Items] | |||||||||||||||||||||
Restructuring costs | 100 | 400 | |||||||||||||||||||
Global Cost Reduction Program | Other Geographical Locations | |||||||||||||||||||||
Restructuring Cost and Reserve [Line Items] | |||||||||||||||||||||
Restructuring costs | 600 | 400 | |||||||||||||||||||
Global Cost Reduction Program | Europe, Canada and United States | |||||||||||||||||||||
Restructuring Cost and Reserve [Line Items] | |||||||||||||||||||||
Restructuring costs | $ 1,300 | $ 1,900 | |||||||||||||||||||
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