Operating Segments - Segment Information to Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Real estate	$ 377,383	$ 387,790
Investment in unconsolidated joint ventures	51,786	81,780
Notes and interest receivable	123,556	112,357
Receivable from related parties	159,777	141,541
Total assets	879,082	865,918
Operating segments
Segment Reporting Information [Line Items]
Total assets	342,965	348,404
Segment Reconciling Items
Segment Reporting Information [Line Items]
Real estate	65,149	70,006
Investment in unconsolidated joint ventures	51,786	81,780
Notes and interest receivable	123,556	112,357
Receivable from related parties	159,777	141,541
Cash and other non-segment assets	$ 135,849	$ 111,830