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Long-Term Debt - Debt Issuance Costs (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Debt Issuance Costs, Gross $ 0 $ 0  
Amortization of Debt Issuance Costs 338 337  
Debt Issuance Costs, Net $ 2,335 $ 2,673 $ 3,010