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DEBT - Summary of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Apr. 20, 2020
Dec. 31, 2019
Jan. 31, 2019
Feb. 15, 2015
Debt Instruments          
Total long-term debt, including current maturities $ 90,898   $ 89,514    
Less current maturities (1,660)   (6,165)    
Total long-term debt 89,238   83,349    
Revolving Credit Facility          
Debt Instruments          
Total long-term debt, including current maturities 80,575 $ 170,000 73,225 $ 225,000 $ 170,000
Obligations Under Finance Lease          
Debt Instruments          
Total long-term debt, including current maturities $ 10,323   11,783    
Insurance Premiums Financing Note          
Debt Instruments          
Total long-term debt, including current maturities     $ 4,506