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Accrued Liabilities - Severance Payments, Covid (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |
Payments for restructuring | $ 4,822 | $ 11,508
COVID-19 Related |  |
Restructuring Cost and Reserve [Line Items] |  |
Payments for restructuring | 120 | 4,925
YP Integration Related |  |
Restructuring Cost and Reserve [Line Items] |  |
Payments for restructuring | 0 | 3,377
Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Payments for restructuring | $ 4,702 | $ 3,206

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