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Reporting Segments and Related Information - Revenue Components of Real Estate Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue from External Customer [Line Items]    
Equity in earnings of unconsolidated joint ventures, net $ 876 $ 167
Total expenses 11,694 11,924
Operating results from commercial and unconsolidated joint ventures 219 1,981
Real estate - commercial/industrial    
Revenue from External Customer [Line Items]    
Commercial revenues 2,826 2,154
Equity in earnings of unconsolidated joint ventures, net 876 167
Commercial revenues and equity in earnings of unconsolidated joint ventures 3,702 2,321
Total expenses 1,792 1,319
Operating results from commercial and unconsolidated joint ventures $ 1,910 $ 1,002