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Mortgages and Other Notes Payable - Schedule of Debt (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Aug. 25, 2021	Jun. 04, 2021	Mar. 04, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 185,004				$ 242,711
Mortgages and other notes payable | 600 Las Colinas
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 0				35,589
Effective Interest Rate	5.30%
Mortgages and other notes payable | 770 South Post Oak
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 11,709				11,871
Effective Interest Rate	4.40%
Mortgages and other notes payable | Athens
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 1,155				1,155
Effective Interest Rate	5.90%
Mortgages and other notes payable | Chelsea
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 8,077				8,194
Effective Interest Rate	3.40%
Mortgages and other notes payable | EQK Portage - Land
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 3,350				3,350
Effective Interest Rate	10.00%
Mortgages and other notes payable | HSW Partners
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 0				17,790
Effective Interest Rate	9.50%
Mortgages and other notes payable | Forest Grove
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 7,295				7,333
Effective Interest Rate	3.75%
Mortgages and other notes payable | Forest Grove | Prime Rate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Variable interest rate	0.50%
Mortgages and other notes payable | Landing Bayou
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 14,467				14,643
Effective Interest Rate	3.50%
Mortgages and other notes payable | Legacy at Pleasant Grove
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 13,428				13,653
Effective Interest Rate	3.60%
Mortgages and other notes payable | McKinney 36 Land
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 705				820
Effective Interest Rate	8.00%
Mortgages and other notes payable | New Concept Energy
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 3,542				3,542
Effective Interest Rate	6.00%
Mortgages and other notes payable | Overlook at Allenville Phase II
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 0				15,621
Effective Interest Rate	3.80%
Mortgages and other notes payable | Parc at Denham Springs Phase II
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 16,004				16,128
Effective Interest Rate	4.10%
Mortgages and other notes payable | RCM HC Enterprises
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 5,086		$ 1,986		0
Effective Interest Rate	9.50%
Mortgages and other notes payable | Stanford Center
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 39,044				39,093
Effective Interest Rate	6.00%
Mortgages and other notes payable | Sugar Mill Phase III
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 9,237				9,298
Effective Interest Rate	4.50%
Mortgages and other notes payable | Toulon
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 13,786				13,975
Effective Interest Rate	3.20%
Mortgages and other notes payable | Villas at Bon Secour(6)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 19,495	$ 20,015			10,280
Effective Interest Rate	4.00%	3.08%
Mortgages and other notes payable | Vista Ridge
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 9,868				9,979
Effective Interest Rate	4.00%
Mortgages and other notes payable | Windmill Farms
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgages and notes payable	$ 8,756				$ 10,397
Effective Interest Rate	6.00%			5.00%

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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