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Segment Information - Percentage of Total Sales by Product Group (Details) - Sales | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Breathing Apparatus |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 22.00% | 24.00% | 24.00% | 26.00%
Fixed Gas & Flame Detection |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 21.00% | 22.00% | 20.00% | 20.00%
Portable Gas Detection |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 12.00% | 13.00% | 13.00% | 13.00%
Industrial Head Protection |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 12.00% | 11.00% | 12.00% | 10.00%
Fall Protection [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 8.00% | 9.00% | 8.00% | 9.00%
Firefighter Helmets and Protective Apparel |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 11.00% | 4.00% | 7.00% | 5.00%
Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 14.00% | 17.00% | 16.00% | 17.00%

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