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LONG-TERM DEBT - (Schedule of Maturities of Long-term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2021 $ 0  
2022 0  
2023 0  
2024 0  
2025 0  
Thereafter 121,000  
Total debt maturities 121,000  
Less deferred financing costs 2,224 $ 1,317
Total debt maturities, net $ 118,776 $ 98,683