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GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense $ 6,200 $ 9,655 $ 13,286 $ 18,031