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Summary of Restructuring Costs for Each Segment and Unallocated Corporate Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | $ 5,840 | $ 414 | $ 3,757
2016 Restructuring |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 3,148 |  |
2016 Restructuring | Minimum |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Expected Cumulative Costs | 4,500 |  |
2016 Restructuring | Maximum |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Expected Cumulative Costs | 5,500 |  |
2016 Restructuring | Laser Products |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 55 |  |
2016 Restructuring | Laser Products | Minimum |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Expected Cumulative Costs | 300 |  |
2016 Restructuring | Laser Products | Maximum |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Expected Cumulative Costs | 400 |  |
2016 Restructuring | Vision Technologies |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 2,200 |  |
2016 Restructuring | Vision Technologies | Minimum |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Expected Cumulative Costs | 3,200 |  |
2016 Restructuring | Vision Technologies | Maximum |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Expected Cumulative Costs | 3,700 |  |
2016 Restructuring | Precision Motion |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 833 |  |
2016 Restructuring | Precision Motion | Minimum |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Expected Cumulative Costs | 700 |  |
2016 Restructuring | Precision Motion | Maximum |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Expected Cumulative Costs | 1,000 |  |
2016 Restructuring | Unallocated Corporate and Shared Services |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 60 |  |
2016 Restructuring | Unallocated Corporate and Shared Services | Minimum |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Expected Cumulative Costs | 300 |  |
2016 Restructuring | Unallocated Corporate and Shared Services | Maximum |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Expected Cumulative Costs | 400 |  |
2015 Restructuring |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 1,484 |  |
2015 Restructuring | Laser Products |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 542 |  |
2015 Restructuring | Vision Technologies |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 525 |  |
2015 Restructuring | Precision Motion |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 79 |  |
2015 Restructuring | Unallocated Corporate and Shared Services |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 338 |  |
2013 Restructuring |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges |  | 25 | 2,463
2013 Restructuring | Laser Products |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges |  |  | 836
2013 Restructuring | Vision Technologies |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges |  |  | 806
2013 Restructuring | Precision Motion |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges |  |  | 378
2013 Restructuring | Unallocated Corporate and Shared Services |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges |  |  | 443
2011 Restructuring |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 1,208 | 389 | 1,287
Cumulative Costs | 5,262 |  |
2011 Restructuring | Laser Products |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 0 |  | 1,042
Restructuring charges reversal |  | (106) |
Cumulative Costs | 1,939 |  |
2011 Restructuring | Vision Technologies |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 0 | 0 | 48
Cumulative Costs | 48 |  |
2011 Restructuring | Precision Motion |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 0 | 0 | 5
Cumulative Costs | 122 |  |
2011 Restructuring | Unallocated Corporate and Shared Services |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges | 1,208 | $ 495 | $ 192
Cumulative Costs | $ 3,153 |  |

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- Definition Amount of costs incurred to date for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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