Real Estate Activity - Schedule of Land and Real Estate Ownership (Details) $ in Thousands	Dec. 31, 2021 USD ($) a	Dec. 31, 2020 USD ($) a
Number of Acres
Land (surface rights) (acre) | a	823,452	823,482
Real estate acquired (acre) | a	57,129	57,041
Total real estate situated in Texas | a	880,581	880,523
Net Book Value
Land (surface rights) | $	$ 0	$ 0
Real estate acquired | $	109,071	108,536
Total real estate situated in Texas | $	$ 109,071	$ 108,536