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Bonds Payable - Schedule of Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Long-term Debt, Fiscal Year Maturity [Abstract]    
Long-term debt $ 245,988 $ 232,989
Bonds    
Long-term Debt, Fiscal Year Maturity [Abstract]    
2021 44,775  
2022 44,775  
2023 130,310  
2024 13,064  
2025 13,064  
Long-term debt $ 245,988