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Long-Term Debt - Credit Facility Net Interest Expense (Details) - Revolving Credit Facility - Line of Credit - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Interest Expense and Amortization of Debt Issue Costs    
Interest expense $ 582 $ 1,360
Debt issue cost amortization 275 186
Unused facility fee 213 109
Total $ 1,070 $ 1,655