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Investments In Affiliated Companies, Partnership And Other Companies Investment in affiliated companies, Partnership and Other Companies (Investment Under Fair Value Method) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 31, 2018
Investments in and Advances to Affiliates, at Fair Value $ 51,415,000 $ 46,858,000    
Net gain related to revaluation 0 (43,350,000) $ 0  
Impairment of investments under fair value 5,100,000      
Subsidiary F        
Investments in and Advances to Affiliates, at Fair Value 39,658,000 43,350,000    
Preferred stock issued       $ 30,000
Percent outstanding       17.00%
Net gain related to revaluation 3,700,000 42,000,000    
Company G        
Investments in and Advances to Affiliates, at Fair Value 7,162,000 3,476,000    
Preferred stock issued 11,500,000      
Net gain related to revaluation $ 3,700,000 3,500,000    
Ownership interest acquired by noncontrolling interest 41.00%      
Company H        
Investments in and Advances to Affiliates, at Fair Value $ 4,595,000 $ 32,000    
Net gain related to revaluation 4,600,000      
Impairment of investments under fair value $ 5,100,000