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Loans to and Investments In Associated Companies (HomeFed) (Narrative) (Details)
6 Months Ended
Jul. 01, 2019
shares
May 31, 2019
director
shares
Jun. 30, 2019
HomeFed      
Investments In Associated Companies [Line Items]      
Maximum voting rights as a percentage of total voting securities voting   45.00%  
Number of directors appointed by Company | director   3  
Company Chairman | HomeFed      
Investments In Associated Companies [Line Items]      
Ownership percentage of company   5.00%  
HomeFed      
Investments In Associated Companies [Line Items]      
Shares of common stock owned   10,852,123  
Equity method investment, ownership percentage   70.00%  
Subsequent Event      
Investments In Associated Companies [Line Items]      
Number of shares authorized to be repurchased 9,250,000    
Subsequent Event | HomeFed      
Investments In Associated Companies [Line Items]      
Equity method investment, ownership percentage     70.00%
Number of shares issued per common stock of acquiree 2    
Subsequent Event | HomeFed      
Investments In Associated Companies [Line Items]      
Number of shares issued 9,300,000