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Restructuring Charges - By type (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring charges          
Restructuring charges $ 743 $ 2,408   $ 1,640 $ 4,136
Organizational Restructuring          
Restructuring charges          
Restructuring charges         1,728
Pandemic Restructuring          
Restructuring charges          
Restructuring charges 605 2,408   1,493 2,408
Property Restructuring          
Restructuring charges          
Restructuring charges 7     16  
Other Restructuring          
Restructuring charges          
Restructuring charges 131     131  
Severance costs          
Restructuring charges          
Restructuring charges 605 2,408   1,493 4,136
Severance costs | Organizational Restructuring          
Restructuring charges          
Restructuring charges     $ 1,700   1,728
Severance costs | Pandemic Restructuring          
Restructuring charges          
Restructuring charges 605 $ 2,408   1,493 $ 2,408
Other restructuring costs | Property Restructuring          
Restructuring charges          
Restructuring charges 7     7  
Other restructuring costs | Other Restructuring          
Restructuring charges          
Restructuring charges $ 131     131  
Impairment | Property Restructuring          
Restructuring charges          
Restructuring charges       $ 9