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Long-Term Debt (Contractual Debt Maturities on Debt Outstanding Following Modification) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2020 $ 88,076  
2021 14,341  
2022 24,886  
2023 214  
2024 7,840  
Total long-term debt 135,357 $ 139,138
Following Modification [Member]    
Debt Instrument [Line Items]    
2020 1,231  
2021 101,186  
2022 24,886  
2023 214  
2024 7,840  
Thereafter  
Total long-term debt $ 135,357