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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill and Other Intangible Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill      
Balance at beginning of period $ 261,767,000 $ 194,052,000  
Translation adjustment 0 0  
Acquisitions 46,739,000 104,150,000  
Impairment 0 (36,435,000) $ 0
Balance at end of period 308,506,000 261,767,000 194,052,000
Other Intangible Assets      
Balance at beginning of period 80,088,000 52,582,000  
Translation adjustment 55,000 (4,000)  
Acquisitions 16,259,000 39,797,000  
Impairment   0  
Amortization (17,197,000) (12,287,000) (15,074,000)
Balance at end of period 79,205,000 80,088,000 52,582,000
Total      
Balance at beginning of period 341,855,000 246,634,000  
Translation adjustment 55,000 (4,000)  
Acquisitions 62,998,000 143,947,000  
Impairment   (36,435,000)  
Amortization (17,197,000) (12,287,000) (15,074,000)
Balance at end of period $ 387,711,000 $ 341,855,000 $ 246,634,000