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Inventories (Schedule of Inventory Current) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventories [Abstract]    
Work in process $ 43,454 $ 42,460
Finished new railcars   85
Parts inventory 3,231 2,747
Total inventories, net $ 46,685 $ 45,292