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Segment Information - Percentage of Total Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue from External Customer [Line Items]
Net sales	$ 339,331	$ 288,775	$ 665,225	$ 554,540
Breathing Apparatus
Revenue from External Customer [Line Items]
Net sales	75,283	70,393	149,901	138,638
Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Net sales	63,599	60,175	124,530	110,956
Portable Gas Detection
Revenue from External Customer [Line Items]
Net sales	41,307	37,015	83,534	73,521
Industrial Head Protection
Revenue from External Customer [Line Items]
Net sales	39,639	35,997	74,594	66,873
Fall Protection [Member]
Revenue from External Customer [Line Items]
Net sales	26,052	25,512	51,757	47,455
Firefighter Helmets and Protective Apparel
Revenue from External Customer [Line Items]
Net sales	46,676	14,061	91,159	28,466
Other
Revenue from External Customer [Line Items]
Net sales	$ 46,775	$ 45,622	$ 89,750	$ 88,631
Sales
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Sales | Breathing Apparatus
Revenue from External Customer [Line Items]
Concentration risk percentage	22.00%	24.00%	23.00%	25.00%
Sales | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	19.00%	21.00%	19.00%	20.00%
Sales | Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	13.00%	13.00%	13.00%
Sales | Industrial Head Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	12.00%	11.00%	12.00%
Sales | Fall Protection [Member]
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	9.00%	8.00%	9.00%
Sales | Firefighter Helmets and Protective Apparel
Revenue from External Customer [Line Items]
Concentration risk percentage	14.00%	5.00%	14.00%	5.00%
Sales | Other
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	16.00%	12.00%	16.00%
Americas
Revenue from External Customer [Line Items]
Net sales	$ 215,339	$ 174,960	$ 424,468	$ 341,528
Americas | Breathing Apparatus
Revenue from External Customer [Line Items]
Net sales	46,678	45,269	96,012	93,959
Americas | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Net sales	33,128	30,660	65,654	58,639
Americas | Portable Gas Detection
Revenue from External Customer [Line Items]
Net sales	27,137	24,669	55,899	49,683
Americas | Industrial Head Protection
Revenue from External Customer [Line Items]
Net sales	31,151	28,205	58,992	52,964
Americas | Fall Protection [Member]
Revenue from External Customer [Line Items]
Net sales	15,094	14,262	29,203	25,490
Americas | Firefighter Helmets and Protective Apparel
Revenue from External Customer [Line Items]
Net sales	37,779	5,676	72,533	11,778
Americas | Other
Revenue from External Customer [Line Items]
Net sales	$ 24,372	$ 26,219	$ 46,175	$ 49,015
Americas | Sales
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Americas | Sales | Breathing Apparatus
Revenue from External Customer [Line Items]
Concentration risk percentage	22.00%	26.00%	23.00%	28.00%
Americas | Sales | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	15.00%	18.00%	15.00%	17.00%
Americas | Sales | Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	14.00%	13.00%	15.00%
Americas | Sales | Industrial Head Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	14.00%	16.00%	14.00%	16.00%
Americas | Sales | Fall Protection [Member]
Revenue from External Customer [Line Items]
Concentration risk percentage	7.00%	8.00%	7.00%	7.00%
Americas | Sales | Firefighter Helmets and Protective Apparel
Revenue from External Customer [Line Items]
Concentration risk percentage	18.00%	3.00%	17.00%	3.00%
Americas | Sales | Other
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	15.00%	11.00%	14.00%
International
Revenue from External Customer [Line Items]
Net sales	$ 123,992	$ 113,815	$ 240,757	$ 213,012
International | Breathing Apparatus
Revenue from External Customer [Line Items]
Net sales	28,605	25,124	53,889	44,679
International | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Net sales	30,471	29,515	58,876	52,317
International | Portable Gas Detection
Revenue from External Customer [Line Items]
Net sales	14,170	12,346	27,635	23,838
International | Industrial Head Protection
Revenue from External Customer [Line Items]
Net sales	8,488	7,792	15,602	13,909
International | Fall Protection [Member]
Revenue from External Customer [Line Items]
Net sales	10,958	11,250	22,554	21,965
International | Firefighter Helmets and Protective Apparel
Revenue from External Customer [Line Items]
Net sales	8,897	8,385	18,626	16,688
International | Other
Revenue from External Customer [Line Items]
Net sales	$ 22,403	$ 19,403	$ 43,575	$ 39,616
International | Sales
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
International | Sales | Breathing Apparatus
Revenue from External Customer [Line Items]
Concentration risk percentage	23.00%	22.00%	22.00%	21.00%
International | Sales | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	25.00%	26.00%	24.00%	25.00%
International | Sales | Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	11.00%	11.00%	11.00%
International | Sales | Industrial Head Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	7.00%	7.00%	6.00%	7.00%
International | Sales | Fall Protection [Member]
Revenue from External Customer [Line Items]
Concentration risk percentage	9.00%	10.00%	9.00%	10.00%
International | Sales | Firefighter Helmets and Protective Apparel
Revenue from External Customer [Line Items]
Concentration risk percentage	7.00%	7.00%	8.00%	8.00%
International | Sales | Other
Revenue from External Customer [Line Items]
Concentration risk percentage	18.00%	17.00%	20.00%	18.00%

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