Notes Payable - Deferred Loan Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Deferred loan costs	$ 5,287	$ 7,155
Less:  deferred loan cost accumulated amortization	(2,278)	(3,401)
Total cost, net of accumulated amortization	$ 3,009	$ 3,754