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DEBT - Long-term Debt (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Debt Instrument [Line Items]      
Long-term debt, gross $ 505,228,000 $ 460,228,000  
Less: unamortized discount and fees (4,637,000) (4,842,000)  
Less: current portion 0 0  
Long-term debt 500,591,000 455,386,000  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Long-term debt, gross   0 $ 0
Term loan credit agreement due 2022      
Debt Instrument [Line Items]      
Long-term debt, gross 135,228,000 135,228,000  
Senior notes due 2025      
Debt Instrument [Line Items]      
Long-term debt, gross $ 325,000,000 $ 325,000,000