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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 677,665 $ 513,820
Additions 6,473 169,248
Disposals (9,235) (4,200)
Measurement period and other adjustments 1,603 41
Currency translation 2,957 (1,244)
Goodwill, ending balance 679,463 677,665
Imaging Centers    
Goodwill [Roll Forward]    
Goodwill, beginning balance 606,483 489,210
Additions 6,473 120,551
Disposals (9,235) (4,200)
Measurement period and other adjustments 1,603 (106)
Currency translation 1,233 1,028
Goodwill, ending balance 606,557 606,483
AI    
Goodwill [Roll Forward]    
Goodwill, beginning balance 71,182 24,610
Additions 0 48,697
Disposals 0 0
Measurement period and other adjustments 0 147
Currency translation 1,724 (2,272)
Goodwill, ending balance $ 72,906 $ 71,182