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Segment Information - Percentage of Total Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from External Customer [Line Items]
Revenues	$ 326,038	$ 325,894
Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	75,446	74,618
Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	$ 60,398	60,931
Concentration risk percentage	19.00%
Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	$ 43,577	44,484
Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	40,726	42,227
Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	35,744	34,956
Fall Protection
Revenue from External Customer [Line Items]
Revenues	30,128	25,705
Other
Revenue from External Customer [Line Items]
Revenues	$ 40,019	$ 42,973
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%	23.00%
Sales | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage		19.00%
Sales | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	14.00%
Sales | Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	13.00%
Sales | Industrial Head Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	11.00%
Sales | Fall Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	9.00%	8.00%
Sales | Other
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	12.00%
Americas
Revenue from External Customer [Line Items]
Revenues	$ 213,687	$ 209,129
Americas | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	50,904	49,333
Americas | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	32,930	32,526
Americas | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	35,064	34,754
Americas | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	26,991	28,762
Americas | Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	27,836	27,841
Americas | Fall Protection
Revenue from External Customer [Line Items]
Revenues	17,961	14,109
Americas | Other
Revenue from External Customer [Line Items]
Revenues	$ 22,001	$ 21,804
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%	24.00%
Americas | Sales | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	15.00%	15.00%
Americas | Sales | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Concentration risk percentage	16.00%	17.00%
Americas | Sales | Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	14.00%
Americas | Sales | Industrial Head Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	13.00%
Americas | Sales | Fall Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	7.00%
Americas | Sales | Other
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	10.00%
International
Revenue from External Customer [Line Items]
Revenues	$ 112,351	$ 116,765
International | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	24,542	25,285
International | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	27,468	28,405
International | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	8,513	9,730
International | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	13,735	13,465
International | Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	7,908	7,115
International | Fall Protection
Revenue from External Customer [Line Items]
Revenues	12,167	11,596
International | Other
Revenue from External Customer [Line Items]
Revenues	$ 18,018	$ 21,169
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%	22.00%
International | Sales | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	24.00%	24.00%
International | Sales | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	8.00%
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	7.00%	6.00%
International | Sales | Fall Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	10.00%
International | Sales | Other
Revenue from External Customer [Line Items]
Concentration risk percentage	16.00%	18.00%

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