Concentration Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Concentration Risk
Rental income recognized	$ 45,251	$ 43,693
Approximate total acres | Geographic concentration
Concentration Risk
Concentration risk (as a percent)	100.00%	100.00%
Approximate total acres | Geographic concentration | Alabama
Concentration Risk
Concentration risk (as a percent)	0.40%	0.40%
Approximate total acres | Geographic concentration | Arkansas
Concentration Risk
Concentration risk (as a percent)	7.90%	8.90%
Approximate total acres | Geographic concentration | California
Concentration Risk
Concentration risk (as a percent)	7.30%	7.50%
Approximate total acres | Geographic concentration | Colorado
Concentration Risk
Concentration risk (as a percent)	16.10%	15.80%
Approximate total acres | Geographic concentration | Florida
Concentration Risk
Concentration risk (as a percent)	3.00%	3.00%
Approximate total acres | Geographic concentration | Georgia
Concentration Risk
Concentration risk (as a percent)	2.90%	3.40%
Approximate total acres | Geographic concentration | Illinois
Concentration Risk
Concentration risk (as a percent)	23.80%	24.70%
Approximate total acres | Geographic concentration | Kansas
Concentration Risk
Concentration risk (as a percent)	1.20%	1.30%
Approximate total acres | Geographic concentration | Louisiana
Concentration Risk
Concentration risk (as a percent)	10.90%	5.50%
Approximate total acres | Geographic concentration | Michigan
Concentration Risk
Concentration risk (as a percent)	0.30%	0.40%
Approximate total acres | Geographic concentration | Mississippi
Concentration Risk
Concentration risk (as a percent)	1.80%	2.80%
Approximate total acres | Geographic concentration | Missouri
Concentration Risk
Concentration risk (as a percent)	0.50%	0.00%
Approximate total acres | Geographic concentration | North Carolina
Concentration Risk
Concentration risk (as a percent)	10.30%	10.70%
Approximate total acres | Geographic concentration | Nebraska
Concentration Risk
Concentration risk (as a percent)	3.70%	3.80%
Approximate total acres | Geographic concentration | South Carolina
Concentration Risk
Concentration risk (as a percent)	8.40%	9.90%
Approximate total acres | Geographic concentration | South Dakota
Concentration Risk
Concentration risk (as a percent)	1.10%	1.10%
Approximate total acres | Geographic concentration | Texas
Concentration Risk
Concentration risk (as a percent)	0.00%	0.00%
Approximate total acres | Geographic concentration | Virginia
Concentration Risk
Concentration risk (as a percent)	0.30%	0.80%
Rental income | Tenant concentration | Tenant A
Concentration Risk
Rental income recognized	$ 9,436	$ 7,924
Concentration risk (as a percent)	20.20%	17.80%
Rental income | Geographic concentration
Concentration Risk
Concentration risk (as a percent)	100.00%	100.00%
Rental income | Geographic concentration | Alabama
Concentration Risk
Concentration risk (as a percent)	0.20%	0.20%
Rental income | Geographic concentration | Arkansas
Concentration Risk
Concentration risk (as a percent)	3.70%	4.20%
Rental income | Geographic concentration | California
Concentration Risk
Concentration risk (as a percent)	36.90%	32.60%
Rental income | Geographic concentration | Colorado
Concentration Risk
Concentration risk (as a percent)	6.30%	5.70%
Rental income | Geographic concentration | Florida
Concentration Risk
Concentration risk (as a percent)	2.50%	2.50%
Rental income | Geographic concentration | Georgia
Concentration Risk
Concentration risk (as a percent)	1.60%	2.30%
Rental income | Geographic concentration | Illinois
Concentration Risk
Concentration risk (as a percent)	25.50%	26.70%
Rental income | Geographic concentration | Kansas
Concentration Risk
Concentration risk (as a percent)	0.30%	0.40%
Rental income | Geographic concentration | Louisiana
Concentration Risk
Concentration risk (as a percent)	4.00%	3.10%
Rental income | Geographic concentration | Michigan
Concentration Risk
Concentration risk (as a percent)	0.50%	0.40%
Rental income | Geographic concentration | Mississippi
Concentration Risk
Concentration risk (as a percent)	1.00%	1.80%
Rental income | Geographic concentration | Missouri
Concentration Risk
Concentration risk (as a percent)	0.10%	0.00%
Rental income | Geographic concentration | North Carolina
Concentration Risk
Concentration risk (as a percent)	6.90%	7.80%
Rental income | Geographic concentration | Nebraska
Concentration Risk
Concentration risk (as a percent)	3.20%	3.30%
Rental income | Geographic concentration | South Carolina
Concentration Risk
Concentration risk (as a percent)	6.60%	8.00%
Rental income | Geographic concentration | South Dakota
Concentration Risk
Concentration risk (as a percent)	0.40%	0.40%
Rental income | Geographic concentration | Texas
Concentration Risk
Concentration risk (as a percent)	0.00%	0.20%
Rental income | Geographic concentration | Virginia
Concentration Risk
Concentration risk (as a percent)	0.30%	0.40%