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