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Investments in Partially Owned Entities (Summary of Income (Loss) subnote ) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 26, 2017
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Schedule Of Equity Method Investments        
Gain (loss) on sale of property     $ 2,267 $ 2,210
Suffolk Downs        
Schedule Of Equity Method Investments        
Gain (loss) on sale of property $ 15,314 $ 15,314    
Gain on debt investments $ 11,373 11,373    
Gain recognized on the sale of property and repayment of debt   $ 26,687