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Marketable Securities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 12, 2019
Mar. 01, 2019
Mar. 31, 2019
Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Increase (decrease) in fair value of marketable securities     $ 461 $ (32,986)
Lexington Realty Trust        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Shares sold (shares)   18,468,969    
Proceeds from sale of equity method investments   $ 167,698    
Mark-to-market increase in fair value     16,068  
Increase (decrease) in fair value of marketable securities     16,068 (32,875)
PREIT        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Shares issued upon conversion of operating partnership units (shares) 6,250,000      
Increase (decrease) in fair value of marketable securities     $ (15,649) $ 0