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GOODWILL (Tables)
12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The change in carrying value of goodwill in the period was as follows (in thousands):

Balance at December 31, 2017$58,327  
Acquisitions completed during the year ended December 31, 2018203,378  
Balance at December 31, 2018261,705  
Acquisitions completed during the year ended December 31, 201910,832  
Sale of asset group (Note 8)(4,221) 
Other adjustments(1,971) 
Balance at December 31, 2019$266,345