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Related Party Transactions Stratus Kingwood, L.P. (Details) $ in Thousands	Aug. 03, 2018 USD ($) a	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Cash and cash equivalents		$ 23,882	$ 19,173
Restricted cash		13,824	19,418
Real estate under development		100,953	95,026
Land available for development		46,070	45,539
Other assets		18,756	14,548
Total assets		558,938	561,368	$ 528,783
Debt		373,068	365,749
Total liabilities		426,932	427,286
The Saint Mary, L.P. and Stratus Kingwood, L.P. [Member]
Related Party Transaction [Line Items]
Cash and cash equivalents		2,109	1,110
Real estate under development		9,585	3,703
Land available for development		4,163	9,273
Real estate held for investment, net		64,263	64,637
Other assets		1,878	1,807
Total assets		81,998	80,530
Accounts payable and accrued liabilities		4,973	8,680
Debt		51,974	45,848
Total liabilities		56,947	54,528
Net Assets		$ 25,051	$ 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