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Segment Information - Percentage of Total Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue from External Customer [Line Items]
Revenues	$ 351,014	$ 331,096	$ 1,026,726	$ 996,320
Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	75,855	64,951	$ 206,564	189,482
Concentration risk percentage			20.00%
Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	71,312	80,424	$ 221,666	230,324
Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	44,240	39,405	127,309	122,939
Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	42,804	35,821	135,181	126,981
Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	37,730	36,938	112,395	111,532
Fall Protection
Revenue from External Customer [Line Items]
Revenues	34,639	27,939	96,396	79,696
Other
Revenue from External Customer [Line Items]
Revenues	$ 44,434	$ 45,618	$ 127,215	$ 135,366
Sales
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Sales | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	22.00%	20.00%		13.00%
Sales | Breathing Apparatus
Revenue from External Customer [Line Items]
Concentration risk percentage	20.00%	24.00%	22.00%	23.00%
Sales | Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	12.00%	12.00%	12.00%
Sales | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	11.00%	13.00%	19.00%
Sales | Industrial Head Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	11.00%	11.00%	11.00%
Sales | Fall Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	10.00%	8.00%	9.00%	8.00%
Sales | Other
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	14.00%	13.00%	14.00%
Americas
Revenue from External Customer [Line Items]
Revenues	$ 234,624	$ 209,343	$ 679,699	$ 633,812
Americas | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	42,953	33,803	115,001	99,459
Americas | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	46,287	50,282	147,776	146,293
Americas | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	30,305	26,755	85,763	82,654
Americas | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	35,017	30,373	109,173	102,906
Americas | Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	29,217	28,909	87,475	87,901
Americas | Fall Protection
Revenue from External Customer [Line Items]
Revenues	22,972	16,465	59,653	45,668
Americas | Other
Revenue from External Customer [Line Items]
Revenues	$ 27,873	$ 22,756	$ 74,858	$ 68,931
Americas | Sales
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Americas | Sales | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	18.00%	16.00%	17.00%	16.00%
Americas | Sales | Breathing Apparatus
Revenue from External Customer [Line Items]
Concentration risk percentage	20.00%	24.00%	22.00%	23.00%
Americas | Sales | Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	13.00%	13.00%	13.00%
Americas | Sales | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Concentration risk percentage	15.00%	15.00%	16.00%	16.00%
Americas | Sales | Industrial Head Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	14.00%	13.00%	14.00%
Americas | Sales | Fall Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	10.00%	8.00%	9.00%	7.00%
Americas | Sales | Other
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	10.00%	10.00%	11.00%
International
Revenue from External Customer [Line Items]
Revenues	$ 116,390	$ 121,753	$ 347,027	$ 362,508
International | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	32,902	31,148	91,563	90,023
International | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	25,025	30,142	73,890	84,031
International | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	13,935	12,650	41,546	40,285
International | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	7,787	5,448	26,008	24,075
International | Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	8,513	8,029	24,920	23,631
International | Fall Protection
Revenue from External Customer [Line Items]
Revenues	11,667	11,474	36,743	34,028
International | Other
Revenue from External Customer [Line Items]
Revenues	$ 16,561	$ 22,862	$ 52,357	$ 66,435
International | Sales
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
International | Sales | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	28.00%	26.00%	26.00%	25.00%
International | Sales | Breathing Apparatus
Revenue from External Customer [Line Items]
Concentration risk percentage	22.00%	25.00%	21.00%	23.00%
International | Sales | Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	10.00%	12.00%	11.00%
International | Sales | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Concentration risk percentage	7.00%	4.00%	7.00%	7.00%
International | Sales | Industrial Head Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	7.00%	7.00%	7.00%	7.00%
International | Sales | Fall Protection
Revenue from External Customer [Line Items]
Concentration risk percentage	10.00%	9.00%	11.00%	9.00%
International | Sales | Other
Revenue from External Customer [Line Items]
Concentration risk percentage	14.00%	19.00%	16.00%	18.00%

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