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Segment Information - Percentage of Total Sales by Product Group (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenue from External Customer [Line Items] |  |
Net sales | $ 325,894 | $ 265,765
Breathing Apparatus |  |
Revenue from External Customer [Line Items] |  |
Net sales | 74,618 | 68,245
Fixed Gas & Flame Detection |  |
Revenue from External Customer [Line Items] |  |
Net sales | 60,931 | 50,781
Portable Gas Detection |  |
Revenue from External Customer [Line Items] |  |
Net sales | 42,227 | 36,506
Industrial Head Protection |  |
Revenue from External Customer [Line Items] |  |
Net sales | 34,956 | 30,876
Fall Protection [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales | 25,705 | 21,942
Firefighter Helmets and Protective Apparel |  |
Revenue from External Customer [Line Items] |  |
Net sales | 44,484 | 14,406
Other |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 42,973 | $ 43,009
Sales |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Sales | Breathing Apparatus |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 23.00% | 26.00%
Sales | Fixed Gas & Flame Detection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 19.00% | 19.00%
Sales | Portable Gas Detection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 13.00% | 14.00%
Sales | Industrial Head Protection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 11.00% | 12.00%
Sales | Fall Protection [Member] |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 8.00% | 8.00%
Sales | Firefighter Helmets and Protective Apparel |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 14.00% | 5.00%
Sales | Other |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 12.00% | 16.00%
Americas |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 209,129 | $ 166,568
Americas | Breathing Apparatus |  |
Revenue from External Customer [Line Items] |  |
Net sales | 49,333 | 48,690
Americas | Fixed Gas & Flame Detection |  |
Revenue from External Customer [Line Items] |  |
Net sales | 32,526 | 27,978
Americas | Portable Gas Detection |  |
Revenue from External Customer [Line Items] |  |
Net sales | 28,762 | 25,015
Americas | Industrial Head Protection |  |
Revenue from External Customer [Line Items] |  |
Net sales | 27,841 | 24,760
Americas | Fall Protection [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales | 14,109 | 11,228
Americas | Firefighter Helmets and Protective Apparel |  |
Revenue from External Customer [Line Items] |  |
Net sales | 34,754 | 6,101
Americas | Other |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 21,804 | $ 22,796
Americas | Sales |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Americas | Sales | Breathing Apparatus |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 24.00% | 29.00%
Americas | Sales | Fixed Gas & Flame Detection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 15.00% | 17.00%
Americas | Sales | Portable Gas Detection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 14.00% | 15.00%
Americas | Sales | Industrial Head Protection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 13.00% | 15.00%
Americas | Sales | Fall Protection [Member] |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 7.00% | 7.00%
Americas | Sales | Firefighter Helmets and Protective Apparel |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 17.00% | 4.00%
Americas | Sales | Other |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 10.00% | 13.00%
International |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 116,765 | $ 99,197
International | Breathing Apparatus |  |
Revenue from External Customer [Line Items] |  |
Net sales | 25,285 | 19,555
International | Fixed Gas & Flame Detection |  |
Revenue from External Customer [Line Items] |  |
Net sales | 28,405 | 22,803
International | Portable Gas Detection |  |
Revenue from External Customer [Line Items] |  |
Net sales | 13,465 | 11,491
International | Industrial Head Protection |  |
Revenue from External Customer [Line Items] |  |
Net sales | 7,115 | 6,116
International | Fall Protection [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales | 11,596 | 10,714
International | Firefighter Helmets and Protective Apparel |  |
Revenue from External Customer [Line Items] |  |
Net sales | 9,730 | 8,305
International | Other |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 21,169 | $ 20,213
International | Sales |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
International | Sales | Breathing Apparatus |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 22.00% | 20.00%
International | Sales | Fixed Gas & Flame Detection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 24.00% | 23.00%
International | Sales | Portable Gas Detection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 12.00% | 12.00%
International | Sales | Industrial Head Protection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 6.00% | 6.00%
International | Sales | Fall Protection [Member] |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 10.00% | 11.00%
International | Sales | Firefighter Helmets and Protective Apparel |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 8.00% | 8.00%
International | Sales | Other |  |
Revenue from External Customer [Line Items] |  |
Concentration risk percentage | 18.00% | 20.00%

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