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GOODWILL AND OTHER INTANGIBLE ASSETS (Summary of Intangible Assets) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Amortized intangible assets: |  |  |
Gross Carrying Amount | $ 149,368 |  | $ 146,103
Accumulated Amortization | (54,623) |  | (50,643)
Net Value | 94,745 |  | 95,460
Aggregate amortization expense | 2,818 | $ 2,429 |
Future estimated amortization expense |  |  |
2018 | 8,448 |  |
2019 | 11,082 |  |
2020 | 9,840 |  |
2021 | 9,644 |  |
2022 and thereafter | $ 55,731 |  |
Weighted Average |  |  |
Amortized intangible assets: |  |  |
Amortization Period | 11 years 9 months 18 days |  |
Patents |  |  |
Amortized intangible assets: |  |  |
Gross Carrying Amount | $ 8,144 |  | 7,819
Accumulated Amortization | (8,015) |  | (7,806)
Net Value | $ 129 |  | 13
Patents | Weighted Average |  |  |
Amortized intangible assets: |  |  |
Amortization Period | 2 months 12 days |  |
Technology |  |  |
Amortized intangible assets: |  |  |
Gross Carrying Amount | $ 48,797 |  | 47,571
Accumulated Amortization | (15,816) |  | (14,624)
Net Value | $ 32,981 |  | 32,947
Technology | Weighted Average |  |  |
Amortized intangible assets: |  |  |
Amortization Period | 15 years |  |
Customer relationships |  |  |
Amortized intangible assets: |  |  |
Gross Carrying Amount | $ 70,120 |  | 68,886
Accumulated Amortization | (15,181) |  | (13,401)
Net Value | $ 54,939 |  | 55,485
Customer relationships | Weighted Average |  |  |
Amortized intangible assets: |  |  |
Amortization Period | 12 years 2 months 12 days |  |
License agreements and other |  |  |
Amortized intangible assets: |  |  |
Gross Carrying Amount | $ 22,307 |  | 21,827
Accumulated Amortization | (15,611) |  | (14,812)
Net Value | $ 6,696 |  | $ 7,015
License agreements and other | Weighted Average |  |  |
Amortized intangible assets: |  |  |
Amortization Period | 7 years 7 months 6 days |  |

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