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Goodwill and Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 109,434 | $ 97,680
Accumulated Amortization | (43,246) | (38,127)
Net Carrying Amount | 66,188 | 59,553
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 18,196 | 16,528
Accumulated Amortization | (4,334) | (3,737)
Net Carrying Amount | 13,862 | 12,791
Distribution agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 8,192 | 7,262
Accumulated Amortization | (5,278) | (4,686)
Net Carrying Amount | 2,914 | 2,576
License agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 23,845 | 23,783
Accumulated Amortization | (6,419) | (5,568)
Net Carrying Amount | 17,426 | 18,215
Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 21,516 | 16,224
Accumulated Amortization | (5,550) | (4,686)
Net Carrying Amount | 15,966 | 11,538
Covenants not to compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,028 | 1,028
Accumulated Amortization | (985) | (968)
Net Carrying Amount | 43 | 60
Customer lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 35,737 | 31,935
Accumulated Amortization | (20,680) | (18,482)
Net Carrying Amount | 15,057 | 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

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