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Liabilities - Restructuring Accruals (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
employee
Liabilities    
Number of employees impacted | employee   60
Changes in restructuring accrual    
Balance at the beginning of the period $ 2,841  
Provision 625  
Payments (1,392)  
Balance at the end of the period $ 2,074