Annual report pursuant to Section 13 and 15(d)

Real Estate - Narrative (Details)

v3.20.4
Real Estate - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
a
$ / a
Dec. 31, 2019
USD ($)
a
$ / a
Dec. 31, 2018
USD ($)
a
$ / a
Real Estate Properties [Line Items]                      
Revenue $ 74,304 $ 74,383 $ 57,273 $ 96,594 $ 113,332 $ 98,530 $ 87,310 $ 191,324 $ 302,554 $ 490,496 $ 300,220
Texas                      
Real Estate Properties [Line Items]                      
Area of real estate property, sold (in acres) | a                 22,160 21,986 171
Acres of land exchanged from trust (in acres) | a                   5,620  
Acres of land received from exchange (in acres) | a                   5,545  
Additions (acres) | a                 756 21,671 14,650
Land sales                      
Real Estate Properties [Line Items]                      
Revenue                 $ 17,383 $ 135,020 $ 4,367
Land sales | Texas                      
Real Estate Properties [Line Items]                      
Proceeds from sale of real estate                 $ 16,000 $ 113,000 $ 4,400
Average sales price (in USD per acre) | $ / a                 721 5,141 25,464
Revenue                 $ 1,400 $ 22,000  
Land acquisitions | Texas                      
Real Estate Properties [Line Items]                      
Additions                 $ 3,900 $ 74,400 $ 9,400
Average purchase price (in USD per acre) | $ / a                 5,134 3,434 640