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Term Loans (Details) - Term loans - USD ($)
1 Months Ended
Oct. 31, 2018
Jun. 30, 2021
Dec. 31, 2020
Debt      
Deferred finance costs balance   $ 543,000 $ 642,000
$250 million senior unsecured term loan due March 2024      
Debt      
Face amount of loan $ 250,000,000.0    
Effective yield (as a percent) 3.89%    
$250 million senior unsecured term loan due March 2024 | LIBOR      
Debt      
Basis spread on variable rate (as a percent) 0.85%