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SEGMENT AND GEOGRAPHICAL REPORTING - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Identifiable assets at year end $ 851,861 $ 788,220  
Depreciation 10,396 10,100 $ 9,578
Corporate      
Segment Reporting Information [Line Items]      
Capital expenditures 1,000 9,500 600
Identifiable assets at year end 114,100 56,800 54,700
Depreciation $ 2,300 $ 1,700 $ 1,500