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SIGNIFICANT ACQUISITIONS AND DIVESTITURES - Narrative (Details)
€ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Dec. 13, 2019
USD ($)
May 27, 2019
EUR (€)
May 27, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]              
Cash paid for acquisitions, net of cash acquired         $ 141,062 $ 17,399 $ 17,393
Goodwill       $ 523,998 523,998 447,995 441,361
HNH              
Business Acquisition [Line Items]              
Goodwill       423,600 423,600 405,527  
Specialty Products              
Business Acquisition [Line Items]              
Goodwill       81,981 81,981 22,662  
General and Administrative Expenses              
Business Acquisition [Line Items]              
Transaction and integration related costs         $ 2,273 $ 1,786 $ 2,163
Zumbro River Brand, Inc.              
Business Acquisition [Line Items]              
Payment made on acquisition date $ 52,403            
Amount paid to former shareholders 47,058            
Payments for debt 5,345            
Cash acquired from acquisition 686            
Cash paid for acquisitions, net of cash acquired 46,372            
Goodwill $ 18,073            
Transaction and integration related costs       $ 1,947      
Zumbro River Brand, Inc. | Customer relationships              
Business Acquisition [Line Items]              
Useful life of intangible assets acquired 15 years            
Zumbro River Brand, Inc. | Trade name              
Business Acquisition [Line Items]              
Useful life of intangible assets acquired 10 years            
Zumbro River Brand, Inc. | Developed technology              
Business Acquisition [Line Items]              
Useful life of intangible assets acquired 12 years            
Chemogas              
Business Acquisition [Line Items]              
Payment made on acquisition date   € 99,503 $ 111,324        
Amount paid to former shareholders   88,579 99,102        
Payments for debt   10,924 12,222        
Cash acquired from acquisition   3,943 4,412        
Cash paid for acquisitions, net of cash acquired   € 84,636 94,690        
Goodwill     $ 59,319        
Percentage of outstanding common shares acquired     100.00%        
Chemogas | Specialty Products              
Business Acquisition [Line Items]              
Goodwill     $ 59,319        
Chemogas | Customer relationships              
Business Acquisition [Line Items]              
Useful life of intangible assets acquired         20 years    
Chemogas | Trade name              
Business Acquisition [Line Items]              
Useful life of intangible assets acquired         2 years    
Chemogas | Developed technology              
Business Acquisition [Line Items]              
Useful life of intangible assets acquired         10 years