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Goodwill and Intangible Assets - Finite-Lived and Indefinite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ (178,131) $ (169,109)
Gross Carrying Amount 528,440 528,157
Net Amortizable Intangibles 350,309 359,048
Customer relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 337,758 337,546
Accumulated Amortization (115,819) (110,228)
Net Amortizable Intangibles 221,939 227,318
Patents and technology    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 104,384 104,394
Accumulated Amortization (18,855) (17,148)
Net Amortizable Intangibles 85,529 87,246
Non-compete agreements    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 6,259 6,245
Accumulated Amortization (5,694) (5,600)
Net Amortizable Intangibles 565 645
Trade names    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 47,560 47,493
Accumulated Amortization (19,336) (18,107)
Net Amortizable Intangibles 28,224 29,386
Distributor relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 22,160 22,160
Accumulated Amortization (17,918) (17,602)
Net Amortizable Intangibles 4,242 4,558
Trademarks    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,319 10,319
Accumulated Amortization (509) (424)
Net Amortizable Intangibles $ 9,810 $ 9,895
Minimum | Customer relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 4 years 4 years
Minimum | Patents and technology    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 5 years 5 years
Minimum | Non-compete agreements    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 3 years 3 years
Minimum | Trade names    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 10 years 10 years
Minimum | Distributor relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 8 years 8 years
Minimum | Trademarks    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 15 years 15 years
Maximum | Customer relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 15 years 15 years
Maximum | Patents and technology    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 17 years 17 years
Maximum | Non-compete agreements    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 6 years 6 years
Maximum | Trade names    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 15 years 15 years
Maximum | Distributor relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 15 years 15 years