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RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Accrual Activity for Severance and Related Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Restructuring Reserve [Roll Forward] |  |  |  |
Initiatives charged to expense | $ 3,290 | $ 2,372 | $ 10,726 | $ 16,448
Facilities |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | 900 |
Balance at the end of the period | 800 |  | 800 |
2020 Restructuring Initiative |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | 0 |
Initiatives charged to expense | 2,900 |  | 8,690 |
Cash payments |  |  | (3,454) |
Balance at the end of the period | 5,236 |  | 5,236 |
2020 Restructuring Initiative | Severance |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | 0 |
Initiatives charged to expense |  |  | 7,691 |
Cash payments |  |  | (3,375) |
Balance at the end of the period | 4,316 |  | 4,316 |
2020 Restructuring Initiative | Facilities |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | 0 |
Initiatives charged to expense |  |  | 999 |
Cash payments |  |  | (79) |
Balance at the end of the period | 920 |  | 920 |
2019 Restructuring Initiative |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | 3,101 |
Initiatives charged to expense |  |  | 2,196 |
Adjustments for changes in estimate |  |  | (102) |
Reclassify accelerated amortization to operating lease liabilities |  |  | (70) |
Cash payments |  |  | (3,807) |
Balance at the end of the period | 1,318 |  | 1,318 |
2019 Restructuring Initiative | Severance |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | 2,110 |
Initiatives charged to expense |  |  | 723 |
Adjustments for changes in estimate |  |  | (80) |
Reclassify accelerated amortization to operating lease liabilities |  |  | 0 |
Cash payments |  |  | (2,234) |
Balance at the end of the period | 519 |  | 519 |
2019 Restructuring Initiative | Facilities |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance at the beginning of the period |  |  | 991 |
Initiatives charged to expense |  |  | 1,473 |
Adjustments for changes in estimate |  |  | (22) |
Reclassify accelerated amortization to operating lease liabilities |  |  | (70) |
Cash payments |  |  | (1,573) |
Balance at the end of the period | $ 799 |  | $ 799 |

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