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Related Party Transactions Stratus Kingwood, L.P. (Details) $ in Thousands	Aug. 03, 2018 USD ($) a	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)
Related Party Transaction [Line Items]
Cash and cash equivalents		$ 13,422	$ 19,173
Restricted cash		19,627	19,418
Real estate under development		88,534	95,026
Land available for development		61,292	45,539
Other assets		18,220	14,548
Total assets		543,219	561,368	$ 567,932
Debt		368,601	365,749
Total liabilities		422,305	427,286
The Saint Mary, L.P. and Stratus Kingwood, L.P. [Member]
Related Party Transaction [Line Items]
Cash and cash equivalents		3,212	1,110
Real estate under development		2,381	3,703
Land available for development		8,317	9,273
Real estate held for investment, net		67,994	64,637
Other assets		2,186	1,807
Total assets		84,090	80,530
Accounts payable and accrued liabilities		3,724	8,680
Debt		56,277	45,848
Total liabilities		60,001	54,528
Net Assets		$ 24,089	$ 26,002
Stratus Kingwood, L.P. [Member]
Related Party Transaction [Line Items]
Proceeds from Issuance of Private Placement	$ 10,700
Area of Land \| a	54
Kingwood Place [Member]
Related Party Transaction [Line Items]
Payments to Acquire Land	$ 13,500
Land [Member] \| Stratus Kingwood, L.P. [Member]
Related Party Transaction [Line Items]
Proceeds from Issuance of Private Placement	$ 7,000
Stratus Kingwood, L.P. [Member] \| LCHM Holdings, L.L.C. [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	8.80%
Kingwood Place Loan [Member] \| Notes Payable to Banks [Member] \| Stratus Kingwood, L.P. [Member]
Related Party Transaction [Line Items]
Long-term Debt, Gross	$ 6,750