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RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) executive | Sep. 30, 2019 USD ($) employee | Sep. 30, 2020 USD ($) executive employee | Sep. 30, 2019 USD ($) employee | Dec. 31, 2019 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related | $ 3,290 |  | $ 2,372 | $ 10,726 | $ 16,448 |
Severance and related costs | 1,789 |  | $ 719 | 8,276 | $ 11,619 |
Long-term portion of accrued restructuring | 800 |  |  | 800 |  | $ 900
2020 Restructuring Initiative |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related | 2,900 |  |  | 8,690 |  |
Severance and related costs |  | $ 1,100 |  |  |  |
Restructuring and related cost, expected cost | 6,000 |  |  | 6,000 |  |
2020 Restructuring Initiative | Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related |  |  |  | $ 7,691 |  |
Number of positions eliminated | employee |  |  |  | 125 |  |
2020 Restructuring Initiative | Severance | Executives |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of positions eliminated | executive |  | 3 |  | 3 |  |
2020 Restructuring Initiative | Facilities |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related |  |  |  | $ 999 |  |
2019 Restructuring Initiative |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related |  |  |  | $ 2,196 |  |
Number of positions eliminated | employee |  |  | 20 | 5 | 130 |
Restructuring charges, net of adjustments | $ 400 |  | $ 1,800 | $ 2,100 | $ 7,800 |
2019 Restructuring Initiative | Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related |  |  |  | 723 |  |
Restructuring charges, net of adjustments |  |  | 700 | 600 | 6,500 |
2019 Restructuring Initiative | Facilities |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related |  |  |  | 1,473 |  |
Restructuring charges, net of adjustments |  |  | $ 1,700 | 1,500 | 4,700 |
Merger Restructuring Initiative |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and related |  |  |  | $ (100) | $ 5,200 |
Number of positions eliminated | employee |  |  |  | 40 |  |

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