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INDEBTEDNESS Schedule of Aggregate Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2019 $ 17,185  
2020 17,184  
2021 17,184  
2022 17,184  
2023 396,565  
Thereafter 0  
Total $ 465,302 $ 192,000