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Bank Debt (Schedule of Future Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Bank Debt [Abstract]    
2019 $ 34,912  
2020 36,750  
2021 25,725  
2022 82,763  
Total bank debt $ 180,150 $ 188,463