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Goodwill and Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 110,653 | $ 97,680
Accumulated Amortization | (46,088) | (38,127)
Net Carrying Amount | 64,565 | 59,553
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 18,676 | 16,528
Accumulated Amortization | (4,665) | (3,737)
Net Carrying Amount | 14,011 | 12,791
Distribution agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 8,012 | 7,262
Accumulated Amortization | (5,509) | (4,686)
Net Carrying Amount | 2,503 | 2,576
License agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 24,913 | 23,783
Accumulated Amortization | (6,895) | (5,568)
Net Carrying Amount | 18,018 | 18,215
Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 21,514 | 16,224
Accumulated Amortization | (6,039) | (4,686)
Net Carrying Amount | 15,475 | 11,538
Covenants not to compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,028 | 1,028
Accumulated Amortization | (993) | (968)
Net Carrying Amount | 35 | 60
Customer lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 35,590 | 31,935
Accumulated Amortization | (21,987) | (18,482)
Net Carrying Amount | 13,603 | 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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