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LEASES - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease cost $ 1,960 $ 1,784 $ 5,994 $ 5,114
Sublease income (103) (96) (308) (285)
Total lease cost $ 1,857 $ 1,688 $ 5,686 $ 4,829