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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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