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Restructuring Charges - By type (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring charges    
Restructuring charges $ 897 $ 1,728
Organizational Restructuring    
Restructuring charges    
Restructuring charges   1,728
Pandemic Restructuring    
Restructuring charges    
Restructuring charges 888  
Property Restructuring    
Restructuring charges    
Restructuring charges 9  
Severance costs    
Restructuring charges    
Restructuring charges 888 1,728
Severance costs | Organizational Restructuring    
Restructuring charges    
Restructuring charges   $ 1,728
Severance costs | Pandemic Restructuring    
Restructuring charges    
Restructuring charges 888  
Impairment | Property Restructuring    
Restructuring charges    
Restructuring charges $ 9