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LEASES - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lease, Cost [Abstract]        
Operating Lease, Cost $ 1,850 $ 1,981 $ 3,701 $ 4,001
Short-term Lease, Cost 26 40 55 81
Variable Lease, Cost 676 626 1,355 1,267
Lease, Cost $ 2,552 $ 2,647 $ 5,111 $ 5,349