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Concentration Risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Concentration Risk    
Rental income recognized $ 43,693 $ 48,119
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) 8.90% 9.10%
Approximate total acres | Geographic concentration | California    
Concentration Risk    
Concentration risk (as a percent) 7.50% 7.30%
Approximate total acres | Geographic concentration | Colorado    
Concentration Risk    
Concentration risk (as a percent) 15.80% 15.50%
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) 3.40% 3.40%
Approximate total acres | Geographic concentration | Illinois    
Concentration Risk    
Concentration risk (as a percent) 24.70% 24.50%
Approximate total acres | Geographic concentration | Kansas    
Concentration Risk    
Concentration risk (as a percent) 1.30% 1.20%
Approximate total acres | Geographic concentration | Louisiana    
Concentration Risk    
Concentration risk (as a percent) 5.50% 5.30%
Approximate total acres | Geographic concentration | Michigan    
Concentration Risk    
Concentration risk (as a percent) 0.40% 0.30%
Approximate total acres | Geographic concentration | Mississippi    
Concentration Risk    
Concentration risk (as a percent) 2.80% 3.10%
Approximate total acres | Geographic concentration | North Carolina    
Concentration Risk    
Concentration risk (as a percent) 10.70% 10.50%
Approximate total acres | Geographic concentration | Nebraska    
Concentration Risk    
Concentration risk (as a percent) 3.80% 3.80%
Approximate total acres | Geographic concentration | South Carolina    
Concentration Risk    
Concentration risk (as a percent) 9.90% 9.50%
Approximate total acres | Geographic concentration | South Dakota    
Concentration Risk    
Concentration risk (as a percent) 1.10% 1.00%
Approximate total acres | Geographic concentration | Texas    
Concentration Risk    
Concentration risk (as a percent) 0.00% 1.30%
Approximate total acres | Geographic concentration | Virginia    
Concentration Risk    
Concentration risk (as a percent) 0.80% 0.80%
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) 4.20% 4.40%
Rental income | Geographic concentration | California    
Concentration Risk    
Concentration risk (as a percent) 32.60% 34.60%
Rental income | Geographic concentration | Colorado    
Concentration Risk    
Concentration risk (as a percent) 5.70% 5.40%
Rental income | Geographic concentration | Florida    
Concentration Risk    
Concentration risk (as a percent) 2.50% 2.10%
Rental income | Geographic concentration | Georgia    
Concentration Risk    
Concentration risk (as a percent) 2.30% 2.10%
Rental income | Geographic concentration | Illinois    
Concentration Risk    
Concentration risk (as a percent) 26.70% 24.50%
Rental income | Geographic concentration | Kansas    
Concentration Risk    
Concentration risk (as a percent) 0.40% 0.30%
Rental income | Geographic concentration | Louisiana    
Concentration Risk    
Concentration risk (as a percent) 3.10% 3.10%
Rental income | Geographic concentration | Michigan    
Concentration Risk    
Concentration risk (as a percent) 0.40% 0.80%
Rental income | Geographic concentration | Mississippi    
Concentration Risk    
Concentration risk (as a percent) 1.80% 1.70%
Rental income | Geographic concentration | North Carolina    
Concentration Risk    
Concentration risk (as a percent) 7.80% 7.40%
Rental income | Geographic concentration | Nebraska    
Concentration Risk    
Concentration risk (as a percent) 3.30% 3.30%
Rental income | Geographic concentration | South Carolina    
Concentration Risk    
Concentration risk (as a percent) 8.00% 8.20%
Rental income | Geographic concentration | South Dakota    
Concentration Risk    
Concentration risk (as a percent) 0.40% 0.80%
Rental income | Geographic concentration | Texas    
Concentration Risk    
Concentration risk (as a percent) 0.20% 0.70%
Rental income | Geographic concentration | Virginia    
Concentration Risk    
Concentration risk (as a percent) 0.40% 0.40%
Rental income | Tenant concentration | Tenant A    
Concentration Risk    
Rental income recognized $ 2,042 $ 5,905
Concentration risk (as a percent) 4.60% 12.20%
Rental income | Tenant concentration | Tenant B    
Concentration Risk    
Rental income recognized $ 7,924 $ 7,056
Concentration risk (as a percent) 17.80% 14.60%