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Segment Information - Percentage of Total Sales by Product Group (Details) - Sales | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Breathing Apparatus |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 24.00% | 27.00% | 25.00% | 28.00%
Fixed Gas & Flame Detection |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 21.00% | 18.00% | 20.00% | 19.00%
Portable Gas Detection |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 13.00% | 14.00% | 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 |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 9.00% | 8.00% | 9.00% | 8.00%
Fire & Rescue Helmets |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 5.00% | 5.00% | 5.00% | 5.00%
Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk percentage | 16.00% | 17.00% | 16.00% | 17.00%

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