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Leased Railcars (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Leased Railcars [Abstract]    
Railcars Available for Lease, net $ 64,755 $ 23,434
Railcars Available for Lease, cost 70,850 28,074
Railcars Available for Lease, accumulated depreciation $ 6,095 4,640
Lease term 6 years 6 months  
Depreciation Expense on Leased Railcars $ 1,458 $ 704