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Summary Of Significant Accounting Policies And Recent Accounting Pronouncements (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant Accounting Policies [Line Items]        
Goodwill $ 15,794,000 $ 15,794,000 $ 15,800,000 $ 15,800,000
Impairment charges 0 0 $ 0  
Impairment of goodwill $ 0      
Percentage of general reserve on receivables one to thirty days overdue 1.00%      
Percentage of reserve on receivables one year overdue 100.00%      
Maximum period for general reserve with specific maximum percentage 1 year      
Unamortized debt issuance cost $ 20,400,000 $ 11,700,000    
CAIJ [Member]        
Significant Accounting Policies [Line Items]        
Ownership percentage by parent 80.00%      
Railcars [Member]        
Significant Accounting Policies [Line Items]        
Estimated useful life 43 years      
Residual value $ 8,700      
Minimum [Member]        
Significant Accounting Policies [Line Items]        
Period for general reserve with specific minimum percentage 1 day      
Minimum [Member] | Other Specialized Equipment [Member]        
Significant Accounting Policies [Line Items]        
Estimated useful life 12 years 6 months      
Residual value $ 1,000      
Maximum [Member]        
Significant Accounting Policies [Line Items]        
Period for general reserve with specific minimum percentage 30 days      
Maximum [Member] | Other Specialized Equipment [Member]        
Significant Accounting Policies [Line Items]        
Estimated useful life 15 years      
Residual value $ 3,500