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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Non-cash investing and financing transactions:      
Reclassification of pre-development loans (Note 7)     $ 237
Restricted stock issued, net of cancellations (Note 10) $ 1 $ 1 1
Real estate properties | Accrued incentives and earn-out liabilities      
Non-cash investing and financing transactions:      
Contingent liabilities (Note 5)     $ 1,847