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RESTRUCTURING AND OTHER RELATED CHARGES Rollforward of Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Reserve [Roll Forward]        
Charges $ 457 $ 319 $ 2,614 $ 3,365
Operating Group Reorganization Program        
Restructuring Reserve [Roll Forward]        
Charges 457 $ 0 2,614 $ 0
Employee Severance | Operating Group Reorganization Program        
Restructuring Reserve [Roll Forward]        
Balance, beginning of period     0  
Charges     2,614  
Payments     (1,458)  
Balance, end of period $ 1,156   $ 1,156