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LEASES (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Lease cost      
Operating lease costs $ 235 $ 1,797  
Short-term lease costs 1,889 16,094  
Variable lease costs 229 682  
Total lease costs 2,353 18,573  
Other information      
Operating cash flows from operating leases $ 328 $ 1,790  
Weighted-average remaining lease term - operating leases 2 months 12 days 1 year  
Weighted-average discount rate - operating leases 3.70% 3.70%  
Maximum      
LEASES      
Initial lease term 5 years   5 years