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Long-Term Debt (Aggregate Annual Principal Payments on Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Long-Term Debt [Abstract]    
Remainder of 2020 $ 35,002  
2021 110,209  
2022 24,886  
2023 214  
2024 7,840  
Thereafter  
Total long-term debt $ 178,151 $ 135,357