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Goodwill and Intangible Assets - Other Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 106,718 $ 97,680
Accumulated Amortization (40,518) (38,127)
Net Carrying Amount 66,200 59,553
Patents    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 17,356 16,528
Accumulated Amortization (4,023) (3,737)
Net Carrying Amount 13,333 12,791
Distribution agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 7,262 7,262
Accumulated Amortization (4,966) (4,686)
Net Carrying Amount 2,296 2,576
License agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 23,920 23,783
Accumulated Amortization (6,077) (5,568)
Net Carrying Amount 17,843 18,215
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 20,935 16,224
Accumulated Amortization (5,079) (4,686)
Net Carrying Amount 15,856 11,538
Covenants not to compete    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,028 1,028
Accumulated Amortization (976) (968)
Net Carrying Amount 52 60
Customer lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 35,297 31,935
Accumulated Amortization (19,397) (18,482)
Net Carrying Amount 15,900 13,453
In-process technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 920 920
Accumulated Amortization 0 0
Net Carrying Amount $ 920 $ 920