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LEASES - Lessee Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lease expense:        
Contractual lease expense $ 100 $ 100 $ 200 $ 200
Variable lease expense   0 100 100
Operating lease right-of-use asset amortization     1,700 1,600
Operating lease liabilities amortization     1,500 1,500
Maximum        
Lease expense:        
Variable lease expense 100      
Land        
Lease expense:        
Contractual lease expense 3,230 3,216 6,460 6,386
Variable lease expense 27 44 56 87
Land | Other operating expense        
Lease expense:        
Total operating lease expense $ 3,257 $ 3,260 $ 6,516 $ 6,473