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LONG-TERM DEBT - Summary of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Apr. 20, 2020
Dec. 31, 2019
Jan. 31, 2019
Feb. 15, 2015
Debt Instruments          
Other $ 141        
Total long-term debt, including current maturities 88,143   $ 89,514    
Less current maturities (6,791)   (6,165)    
Total long-term debt 81,352   83,349    
Revolving credit agreement          
Debt Instruments          
Total long-term debt, including current maturities 73,025 $ 170,000 73,225 $ 225,000 $ 170,000
Sale-leaseback finance obligations          
Debt Instruments          
Total long-term debt, including current maturities 9,913   11,783    
Insurance premium financing (2019)          
Debt Instruments          
Total long-term debt, including current maturities     $ 4,506    
Insurance premium financing (2020)          
Debt Instruments          
Total long-term debt, including current maturities $ 5,064