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Severance, Restructuring, and Acquisition Integration Activities Severance, Restructuring, and Acquisition Integration Activities - Severance, Restructuring and Integration Costs by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Severance | $ 3,051 | $ 20,754 | $ 788
Other Restructuring and Integration Costs | 9,207 | 5,790 | 21,837
Total Costs | 12,258 | 26,544 | 22,625
FutureLink, Opterna, and SPC Integration Program |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total Costs | 4,900 | 6,100 |
Enterprise Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance | 1,345 | 5,018 | 548
Other Restructuring and Integration Costs | 6,374 | 5,790 | 14,315
Total Costs | 7,719 | 10,808 | 14,863
Industrial Solutions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance | 1,706 | 15,736 | 240
Other Restructuring and Integration Costs | 2,833 | 0 | 7,522
Total Costs | $ 4,539 | $ 15,736 | $ 7,762

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