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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Interest Expense and Amortization of Debt Issue Costs        
Interest expense $ 609 $ 2,339 $ 1,191 $ 3,969
Debt issue cost amortization 275 275 550 461
Unused facility fee 206 32 419 141
Total $ 1,090 $ 2,646 $ 2,160 $ 4,571