Mortgages and Other Notes Payable - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Interest payable	$ 7,550	$ 7,230
Interest costs capitalized	858	585
Mortgages and other notes payable
Debt Instrument [Line Items]
Interest payable	$ 773	$ 844