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GOODWILL - Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Balance at beginning of period $ 475,245 $ 475,025
Acquisitions 95,627  
Foreign currency translation adjustment 33 220
Balance at end of period 570,905 475,245
Accumulated impairment losses (26,000) (19,000)
FMS    
Goodwill [Roll Forward]    
Balance at beginning of period 243,805 243,702
Acquisitions 0  
Foreign currency translation adjustment 15 103
Balance at end of period 243,820 243,805
SCS    
Goodwill [Roll Forward]    
Balance at beginning of period 190,632 190,515
Acquisitions 95,627  
Foreign currency translation adjustment 18 117
Balance at end of period 286,277 190,632
DTS    
Goodwill [Roll Forward]    
Balance at beginning of period 40,808 40,808
Acquisitions 0  
Foreign currency translation adjustment 0 0
Balance at end of period $ 40,808 $ 40,808