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Inventories (Schedule of Inventory Current) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventories [Abstract]    
Work in process $ 35,474 $ 19,742
Finished new railcars 166
Parts inventory 5,481 5,350
Total inventories, net $ 41,121 $ 25,092