Quarterly report pursuant to Section 13 or 15(d)

GOODWILL & INTANGIBLE ASSETS - Goodwill (Details)

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GOODWILL & INTANGIBLE ASSETS - Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 639,301 $ 2,252
May Dental working capital adjustment 23  
Foreign currency translation adjustment (9,302) (4,568)
Goodwill, Ending Balance 630,022 639,301
Accumulated impairment losses 0 0
Acquisition of EnvisionTEC    
Goodwill [Line Items]    
Acquisition   195,688
Goodwill, Ending Balance $ 16,400  
Adaptive 3D Technologies Inc    
Goodwill [Line Items]    
Acquisition   35,113
Aerosint    
Goodwill [Line Items]    
Acquisition   14,581
Dental Arts Labs    
Goodwill [Line Items]    
Acquisition   8,839
AIDRO    
Goodwill [Line Items]    
Acquisition   3,515
Brewer Dental Lab, Inc.    
Goodwill [Line Items]    
Acquisition   2,463
May Dental Lab, Inc.    
Goodwill [Line Items]    
Acquisition   6,782
ExOne Company    
Goodwill [Line Items]    
Acquisition   $ 374,636