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LEASES - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Operating lease expenses:        
Fixed lease expense $ 4,471 $ 4,450 $ 13,467 $ 13,755
Variable lease expense 917 977 2,844 2,897
Total $ 5,388 $ 5,427 $ 16,311 $ 16,652