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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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