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Marketable Securities (Marketable securities portfolio) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Marketable Securities [Roll Forward]    
Beginning balance $ 152,198  
Sale of marketable securities (167,755)  
Transfer of PREIT investment balance at Conversion Date 54,962  
Increase (decrease) in fair value of marketable securities 461 $ (32,986)
Ending balance 39,866  
Lexington Realty Trust    
Marketable Securities [Roll Forward]    
Beginning balance 151,630  
Sale of marketable securities (167,698)  
Transfer of PREIT investment balance at Conversion Date 0  
Increase (decrease) in fair value of marketable securities 16,068  
Ending balance 0  
PREIT    
Marketable Securities [Roll Forward]    
Beginning balance 0  
Sale of marketable securities 0  
Transfer of PREIT investment balance at Conversion Date 54,962  
Increase (decrease) in fair value of marketable securities (15,649)  
Ending balance 39,313  
Other    
Marketable Securities [Roll Forward]    
Beginning balance 568  
Sale of marketable securities (57)  
Transfer of PREIT investment balance at Conversion Date 0  
Increase (decrease) in fair value of marketable securities 42  
Ending balance $ 553