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DEBT - Summary of Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Apr. 20, 2020
Dec. 31, 2019
Jan. 31, 2019
Feb. 15, 2015
Debt Instruments          
Total long-term debt, including current maturities $ 95,222   $ 89,514    
Less current maturities (3,064)   (6,165)    
Total long-term debt 92,158   83,349    
Credit Facility          
Debt Instruments          
Total long-term debt, including current maturities 83,075 $ 170,000 73,225 $ 225,000 $ 170,000
Sale leaseback finance obligations          
Debt Instruments          
Total long-term debt, including current maturities 10,731   11,783    
Insurance Premiums Financing Note | Sale leaseback finance obligations          
Debt Instruments          
Total long-term debt, including current maturities $ 1,416   $ 4,506