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Long-Term Debt - Credit Facility Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Details for the Credit Facility    
Total $ 681,270 $ 680,385
Revolving Credit Facility | Line of Credit    
Details for the Credit Facility    
Principal balance 140,000 140,000
Less: Debt issue cost 2,112 2,387
Total $ 137,888 $ 137,613