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Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 13, 2017 | May 26, 2016 | Sep. 22, 2006 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Debt Instrument |  |  |  |  |
Notes Payable |  |  |  | $ 157,154 | $ 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) |  |  |  | 1.73% |
Debt Instrument, Term |  |  | 20 years |  |
150M Senior Notes |  |  |  |  |
Debt Instrument |  |  |  |  |
Notes Payable | $ 150,000 |  |  |  |
Interest rate (percentage) | 6.25% |  |  |  |
Debt Instrument, Term | 10 years |  |  |  |

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