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Segment Information - Revenue from External Customers by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Revenues	$ 361,783	$ 331,096	$ 339,331	$ 325,894	$ 346,140	$ 296,129	$ 288,775	$ 265,765	$ 1,358,104	$ 1,196,809	$ 1,149,530
Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									100.00%	100.00%	100.00%
Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues									$ 324,672	$ 292,448	$ 303,364
Breathing Apparatus | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									24.00%	24.00%	26.00%
Fixed Gas and Flame Detection
Revenue from External Customer [Line Items]
Revenues									$ 262,432	$ 248,047	$ 239,601
Fixed Gas and Flame Detection | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									19.00%	21.00%	21.00%
Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues									$ 163,716	$ 149,063	$ 142,784
Portable Gas Detection | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									12.00%	12.00%	12.00%
Head Protection [Member]
Revenue from External Customer [Line Items]
Revenues									$ 146,388	$ 133,180	$ 118,197
Head Protection [Member] | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									11.00%	11.00%	10.00%
Fire Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues									$ 169,679		$ 52,577
Fire Helmets & Protective Apparel | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									13.00%		5.00%
Fall Protection
Revenue from External Customer [Line Items]
Revenues									$ 109,472	$ 98,929	$ 97,021
Fall Protection | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									8.00%	8.00%	8.00%
Other
Revenue from External Customer [Line Items]
Revenues									$ 181,745	$ 171,701	$ 195,986
Other | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									13.00%	15.00%	18.00%
Americas
Revenue from External Customer [Line Items]
Revenues									$ 854,287	$ 736,847	$ 678,433
Americas | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									100.00%	100.00%	100.00%
Americas | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues									$ 205,100	$ 191,457	$ 199,252
Americas | Breathing Apparatus | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									24.00%	26.00%	29.00%
Americas | Fixed Gas and Flame Detection
Revenue from External Customer [Line Items]
Revenues									$ 135,922	$ 123,414	$ 125,697
Americas | Fixed Gas and Flame Detection | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									16.00%	17.00%	19.00%
Americas | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues									$ 109,401	$ 98,580	$ 91,200
Americas | Portable Gas Detection | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									13.00%	13.00%	13.00%
Americas | Head Protection [Member]
Revenue from External Customer [Line Items]
Revenues									$ 114,465	$ 105,514	$ 94,750
Americas | Head Protection [Member] | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									13.00%	14.00%	14.00%
Americas | Fire Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues									$ 136,794	$ 69,767	$ 21,880
Americas | Fire Helmets & Protective Apparel | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									16.00%	9.00%	3.00%
Americas | Fall Protection
Revenue from External Customer [Line Items]
Revenues									$ 61,289	$ 54,468	$ 44,571
Americas | Fall Protection | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									7.00%	7.00%	7.00%
Americas | Other
Revenue from External Customer [Line Items]
Revenues									$ 91,316	$ 93,647	$ 101,083
Americas | Other | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									11.00%	14.00%	15.00%
International
Revenue from External Customer [Line Items]
Revenues									$ 503,817	$ 459,962	$ 471,097
International | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									100.00%	100.00%	100.00%
International | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues									$ 119,572	$ 100,991	$ 104,112
International | Breathing Apparatus | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									24.00%	22.00%	22.00%
International | Fixed Gas and Flame Detection
Revenue from External Customer [Line Items]
Revenues									$ 126,510	$ 124,633	$ 113,904
International | Fixed Gas and Flame Detection | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									25.00%	27.00%	24.00%
International | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues									$ 54,315	$ 50,483	$ 51,584
International | Portable Gas Detection | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									11.00%	11.00%	11.00%
International | Head Protection [Member]
Revenue from External Customer [Line Items]
Revenues									$ 31,923	$ 27,666	$ 23,447
International | Head Protection [Member] | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									6.00%	6.00%	5.00%
International | Fire Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues									$ 32,885	$ 33,674	$ 30,697
International | Fire Helmets & Protective Apparel | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									6.00%	7.00%	6.00%
International | Fall Protection
Revenue from External Customer [Line Items]
Revenues									$ 48,183	$ 44,461	$ 52,450
International | Fall Protection | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									10.00%	10.00%	11.00%
International | Other
Revenue from External Customer [Line Items]
Revenues									$ 90,429	$ 78,054	$ 94,903
International | Other | Sales
Revenue from External Customer [Line Items]
Concentration risk (percentage)									18.00%	17.00%	21.00%

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