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DEBT - Summary of Long-term Debt (Details) - USD ($)
$ in Thousands
Apr. 20, 2020
Mar. 31, 2020
Dec. 31, 2019
Jan. 31, 2019
Feb. 15, 2015
Debt Instruments          
Total long-term debt, including current maturities   $ 100,114 $ 89,514    
Less current maturities   (4,613) (6,165)    
Total long-term debt   95,501 83,349    
Credit Facility          
Debt Instruments          
Total long-term debt, including current maturities $ 170,000 86,000 73,225 $ 225,000 $ 170,000
Sale leaseback finance obligations          
Debt Instruments          
Total long-term debt, including current maturities   11,138 11,783    
Insurance Premiums Financing Note | Sale leaseback finance obligations          
Debt Instruments          
Total long-term debt, including current maturities   $ 2,976 $ 4,506