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INTANGIBLE ASSETS AND GOODWILL (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Intangible Assets And Goodwill |  |  |  |  |
Weighted average amortization period (years) |  | 7 years 9 months 25 days | 7 years 10 months 17 days |  |
Cost | $ 349,350,000 |  |  |  | $ 338,150,000
Accumulated amortization | 135,984,000 |  |  |  | 86,759,000
Net carrying value | 213,366,000 |  |  |  | 251,391,000
Amortization and impairment |  | $ 49,225,000 | $ 49,723,000 | $ 22,583,000 |
Estimated future amortization expense for intangible assets |  |  |  |  |
2020 | 48,952,000 |  |  |  |
2021 | 43,495,000 |  |  |  |
2022 | 35,092,000 |  |  |  |
2023 | 27,271,000 |  |  |  |
2024 | 20,201,000 |  |  |  |
Thereafter | 38,355,000 |  |  |  |
Total | 213,366,000 |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill | 392,302,000 |  |  | 338,822,000 | 386,761,000
Accumulated impairment losses | (167,406,000) |  |  | (3,106,000) | (3,106,000)
Goodwill at the beginning of the period |  | 383,655,000 | 335,716,000 |  |
Impairment of goodwill | (164,300,000.0) | (164,300,000) | 0 | 0 |
Goodwill at the end of the period | 224,896,000 | $ 383,655,000 | $ 335,716,000 | 335,716,000 | 383,655,000
In-process research and development |  |  |  |  |
Intangible Assets And Goodwill |  |  |  |  |
Cost | 5,600,000 |  |  |  | 5,600,000
Accumulated amortization | 0 |  |  |  | 0
Net carrying value | 5,600,000 |  |  |  | 5,600,000
Developed technology |  |  |  |  |
Intangible Assets And Goodwill |  |  |  |  |
Weighted average amortization period (years) |  | 6 years 9 months 15 days | 6 years 10 months 28 days |  |
Cost | 188,880,000 |  |  |  | 182,880,000
Accumulated amortization | 100,760,000 |  |  |  | 63,187,000
Net carrying value | 88,120,000 |  |  |  | 119,693,000
Amortization and impairment |  | $ 37,573,000 | $ 38,976,000 | 18,358,000 |
Estimated future amortization expense for intangible assets |  |  |  |  |
Impairment of intangible assets and goodwill |  |  |  | 5,500,000 |
Customer relationships |  |  |  |  |
Intangible Assets And Goodwill |  |  |  |  |
Weighted average amortization period (years) |  | 9 years 5 months 14 days | 9 years 5 months 10 days |  |
Cost | 152,140,000 |  |  |  | 146,940,000
Accumulated amortization | 33,350,000 |  |  |  | 22,218,000
Net carrying value | 118,790,000 |  |  |  | 124,722,000
Amortization and impairment |  | $ 11,132,000 | $ 10,203,000 | 4,145,000 |
Trade names |  |  |  |  |
Intangible Assets And Goodwill |  |  |  |  |
Weighted average amortization period (years) |  | 5 years 2 months 12 days | 5 years 2 months 12 days |  |
Cost | 2,000,000 |  |  |  | 2,000,000
Accumulated amortization | 1,144,000 |  |  |  | 624,000
Net carrying value | 856,000 |  |  |  | 1,376,000
Amortization and impairment |  | $ 520,000 | $ 544,000 | $ 80,000 |
Internal use software |  |  |  |  |
Intangible Assets And Goodwill |  |  |  |  |
Weighted average amortization period (years) |  | 3 years | 3 years |  |
Cost | 730,000 |  |  |  | 730,000
Accumulated amortization | 730,000 |  |  |  | 730,000
Net carrying value | 0 |  |  |  | $ 0
Anova Data, Inc. |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Acquisition |  | $ 5,541,000 | $ 0 |  |
Goodwill at the end of the period | 5,500,000 |  |  |  |
Edgewater |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Acquisition |  | 0 | 48,053,000 |  |
Goodwill at the end of the period | $ 48,053,000 |  |  |  |
Taqua, LLC |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Write-off of goodwill attributable to dissolved subsidiary |  | $ 0 | $ (114,000) |  |

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