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LEASES - Cash flows (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating leases    
Noncash change in operating right-of-use assets $ 21,184 $ 20,439
Change in operating lease liabilities (20,428) (19,711)
Operating right-of-use assets and lease liabilities, net 756 728
Cash paid for amounts included in the measurement of operating lease liabilities $ (23,810) $ (21,714)