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Leased Railcars (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leased Railcars [Abstract]      
Railcars Available for Lease, net $ 23,434 $ 24,018  
Railcars Available for Lease, cost 28,074 27,954  
Railcars Available for Lease, accumulated depreciation $ 4,640 $ 3,936  
Lease utilization rate 73.00% 73.00%  
Lease term 3 years 6 months    
Depreciation Expense on Leased Railcars $ 704 $ 711 $ 499