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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Railcars Available for Lease, Useful Life   40 years    
Research and Development Expense   $ 298 $ 386 $ 379
Goodwill, Impairment Loss   $ 0 $ 0 $ 0
Income tax rate   35.00% 35.00% 35.00%
Scenario, Plan [Member]        
Income tax rate 21.00%      
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]        
Cumulative effect   $ 215    
Accounting Standards Update 2016-09 [Member] | Additional Paid In Capital [Member]        
Cumulative effect   $ 215    
Maximum [Member]        
Warranty period   5 years    
Useful life of assets related to state and local incentives   16 years    
Minimum [Member]        
Useful life of assets related to state and local incentives   7 years    
Income Approach Valuation Technique [Member]        
Valuation weighting   60.00%    
Market Approach Valuation Technique [Member]        
Valuation weighting   40.00%