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Restructuring Charges - Restructuring Liabilities Recognized on Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
VBR | Accrued compensation and benefits    
Restructuring Cost and Reserve [Line Items]    
Accrued compensation and benefits $ 757 $ 6,018
VBR | Other noncurrent liabilities    
Restructuring Cost and Reserve [Line Items]    
Other noncurrent liabilities 0 225
Other | Accrued compensation and benefits    
Restructuring Cost and Reserve [Line Items]    
Accrued compensation and benefits $ 162 $ 778