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Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Feb. 11, 2019
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Intangible assets, Accumulated amortization   $ (198,093)   $ (190,742)
Intangible assets, Gross carrying amount   745,118   603,935
Amortization expense   7,400 $ 5,500  
Future amortization expense [Abstract]        
Remaining, 2019   25,264    
2020   33,890    
2021   33,099    
2022   31,849    
2023   31,061    
2024   30,358    
Amortization included in expense        
Future amortization expense [Abstract]        
Remaining, 2019   20,764    
2020   27,890    
2021   27,099    
2022   25,849    
2023   25,061    
2024   24,358    
Amortization recorded as a reduction of revenue        
Future amortization expense [Abstract]        
Remaining, 2019   4,500    
2020   6,000    
2021   6,000    
2022   6,000    
2023   6,000    
2024   6,000    
Trademarks & tradenames        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Unamortized intangible assets, Gross carrying amount   86,544   86,544
Customer and distributor relationships        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Amortized intangible assets, Gross carrying amount   339,529   214,577
Intangible assets, Accumulated amortization   (101,057)   (97,131)
Sales representation, marketing and promotional rights        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Amortized intangible assets, Gross carrying amount   149,376   149,376
Intangible assets, Accumulated amortization   (43,500)   (42,000)
Patents and other intangible assets        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Amortized intangible assets, Gross carrying amount   68,704   61,473
Intangible assets, Accumulated amortization   (44,783)   (44,242)
Developed technology        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Amortized intangible assets, Gross carrying amount   100,965   91,965
Intangible assets, Accumulated amortization   (8,753)   $ (7,369)
Future amortization expense [Abstract]        
Asset Acquisition, Contingent Consideration Liability   $ 5,500    
Weighted Average        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Finite-lived intangible asset useful life (in years)   22 years    
Weighted Average | Customer and distributor relationships        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Finite-lived intangible asset useful life (in years)   24 years    
Weighted Average | Sales representation, marketing and promotional rights        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Finite-lived intangible asset useful life (in years)   25 years    
Weighted Average | Patents and other intangible assets        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Finite-lived intangible asset useful life (in years)   15 years    
Weighted Average | Developed technology        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Finite-lived intangible asset useful life (in years)   15 years    
Buffalo Filter LLC        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Weighted average amortization period (in years) 16 years      
Buffalo Filter LLC | Customer and distributor relationships        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Weighted average amortization period (in years) 16 years      
Buffalo Filter LLC | Developed technology        
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]        
Finite-lived intangible assets acquired $ 141,000      
Weighted average amortization period (in years) 10 years