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Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 13, 2017
May 26, 2016
Sep. 22, 2006
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument          
Notes Payable       $ 157,450 $ 158,041
BB&T Term Note Payable          
Debt Instrument          
Notes Payable   $ 5,200      
Interest rate (percentage)   1.65%      
Debt Instrument, Term   15 years      
Florida State Board of Administration          
Debt Instrument          
Notes Payable     $ 20,000    
Interest rate (percentage)       0.93%  
Debt Instrument, Term     20 years    
150M Senior Notes          
Debt Instrument          
Notes Payable $ 150,000        
Interest rate (percentage) 6.25%        
Debt Instrument, Term 10 years