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RESTRUCTURING - Restructuring Reserve Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring Reserve [Roll Forward]        
Restructuring charges   $ 2,153   $ 3,368
Costs paid or otherwise settled $ (371) (1,858) $ (735) (3,320)
Ending balance 2,398 1,952 2,398 1,952
Facility-related costs        
Restructuring Reserve [Roll Forward]        
Restructuring charges   1,867   2,447
Costs paid or otherwise settled (333) (1,412) (566) (1,987)
Ending balance 2,297 1,695 2,297 1,695
Personnel-related costs        
Restructuring Reserve [Roll Forward]        
Restructuring charges   (12)   135
Costs paid or otherwise settled (38) (109) (53) (474)
Ending balance 101 171 101 171
Other costs        
Restructuring Reserve [Roll Forward]        
Restructuring charges   298   786
Costs paid or otherwise settled 0 (337) (116) (859)
Ending balance $ 0 $ 86 $ 0 $ 86