Reporting Segments and Related Information - Revenue Components of Real Estate Segments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Commercial revenues	$ 49,523	$ 45,619	$ 35,255
Equity in earnings of unconsolidated joint ventures	16,575	3,834	4,227
Commercial expenses	50,954	45,183	42,773
Operating results from commercial and unconsolidated joint ventures	14,559	5,555	(3,104)
Real estate - commercial/industrial
Revenue from External Customer [Line Items]
Commercial revenues	16,792	8,970	9,001
Equity in earnings of unconsolidated joint ventures	16,575	3,834	4,227
Commercial revenues and equity in earnings of unconsolidated joint ventures	33,367	12,804	13,228
Commercial expenses	12,961	6,246	6,529
Operating results from commercial and unconsolidated joint ventures	20,406	6,558	6,699
Real estate - resort/residential
Revenue from External Customer [Line Items]
Commercial expenses	$ 2,247	$ 1,530	$ 1,955

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