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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill      
Balance at beginning of period $ 194,052 $ 194,052  
Translation adjustment 0 0  
Acquisitions 90,722    
Impairment (36,435)    
Balance at end of period 248,339 194,052 $ 194,052
Other Intangible Assets      
Balance at beginning of period 52,582 67,207  
Translation adjustment (4) 449  
Acquired intangibles 39,797    
Impairment 0    
Amortization (12,287) (15,074) (16,586)
Balance at end of period 80,088 52,582 67,207
Total      
Balance at beginning of period 246,634 261,259  
Translation adjustment (4) 449  
Acquisitions 130,519    
Impairment (36,435)    
Amortization (12,287) (15,074) (16,586)
Balance at end of period $ 328,427 $ 246,634 $ 261,259