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PROPERTY AND EQUIPMENT, NET - Depreciation expense recorded in continuing operations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
PROPERTY AND EQUIPMENT, NET        
Depreciation expense $ 7,510 $ 6,571 $ 14,847 $ 13,181