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Fair Value Measurements (Reconciliation of Beginning and Ending Balances of Level 3 Measurements) (Details) - Level 3 - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Convertible preferred securities          
Reconciliation of Fair Value Measurements Using Level 3          
Asset (liability), Beginning Balance $ 7,404 $ 7,154 $ 7,388 $ 7,388  
Additional investments 1,000 250 100 0  
Asset (liability), Ending Balance 8,404 $ 7,404 7,488 $ 7,388  
Convertible preferred securities | Implied based on market prices          
Quantitative Information about Level 3 Fair Value Measurements          
Asset fair value 8,404   7,488   $ 7,154
Real Property | Market Approach | Rail          
Quantitative Information about Level 3 Fair Value Measurements          
Asset fair value $ 2,719        
Real Property | Sale agreement          
Quantitative Information about Level 3 Fair Value Measurements          
Asset fair value     1,300    
Real Property | National scrap index less cost to sell | Rail          
Quantitative Information about Level 3 Fair Value Measurements          
Asset fair value     $ 4,063