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Mortgages and Other Notes Payable - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]          
Interest payable $ 3,478   $ 3,478   $ 7,639
Interest costs capitalized 3,112 $ 267 7,263 $ 852  
Mortgages and other notes payable          
Debt Instrument [Line Items]          
Interest payable $ 1,328   $ 1,328   $ 1,212