Quarterly report pursuant to Section 13 or 15(d)

LEASES - Components of Lease Expense (Details)

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LEASES - Components of Lease Expense (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lessee, Lease, Description [Line Items]        
Total lease cost $ 1,093,000 $ 1,021,000 $ 2,176,000 $ 1,990,000
Short-term lease costs 200,000 100,000 400,000 100,000
Variable lease costs     0  
Cost of sales, exclusive of depreciation and amortization        
Lessee, Lease, Description [Line Items]        
Total operating lease cost 1,059,000 987,000 2,108,000 1,922,000
Selling, general and administrative        
Lessee, Lease, Description [Line Items]        
Total operating lease cost $ 34,000 $ 34,000 $ 68,000 $ 68,000