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Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 60,724 $ 60,724
Accumulated Amortization 52,149 50,611
Net Carrying Value 8,575 10,113
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of fiscal 2019 1,163  
2019 2,185  
2020 2,017  
2021 1,691  
2022 989  
2023 422  
Thereafter 108  
Net Carrying Value 8,575 10,113
Distribution networks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 38,060 38,060
Accumulated Amortization 38,060 38,060
Net Carrying Value 0 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net Carrying Value 0 0
Completed technologies    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 13,687 13,687
Accumulated Amortization 7,839 6,619
Net Carrying Value 5,848 7,068
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net Carrying Value 5,848 7,068
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 8,607 8,607
Accumulated Amortization 5,973 5,716
Net Carrying Value 2,634 2,891
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net Carrying Value 2,634 2,891
Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 370 370
Accumulated Amortization 277 216
Net Carrying Value 93 154
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Net Carrying Value $ 93 $ 154