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LEASES - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
LEASES        
Operating lease expense $ 6,584 $ 5,803 $ 13,226 $ 11,599
Variable lease expense 963 543 2,295 1,583
Sublease income (156) (42) (311) (134)
Total operating lease expense $ 7,391 $ 6,304 $ 15,210 $ 13,048