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GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 196,364 $ 156,567  
Accumulated Amortization (116,276) (103,985)  
Carrying Amount, net 80,088 52,582 $ 67,207
Amortization of intangible assets 12,287 15,074 $ 16,586
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 193,747 156,282  
Accumulated Amortization (116,028) (103,796)  
Carrying Amount, net 77,719 52,486  
Non-compete agreements      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 2,617 285  
Accumulated Amortization (248) (189)  
Carrying Amount, net $ 2,369 $ 96