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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 information        
Amortization of finance lease right of-of-use assets $ 241   $ 482  
Interest expense related to finance lease liabilities 533   1,060  
Operating lease cost 822 $ 746 1,644 $ 1,492
Short-term lease cost 326 275 632 583
Total lease cost 1,922 1,021 3,818 2,075
Operating cash outflows for finance leases 445   861  
Operating cash outflows for operating leases 635 577 1,253 1,142
Total cash outflows for lease liability measurement $ 1,080 $ 577 $ 2,114 $ 1,142
Automobiles        
Lease information        
Lease term 12 months   12 months