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Inventories (Schedule of Inventory Current) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Inventories [Abstract]      
Work in process $ 44,080   $ 34,355
Parts inventory 4,703   4,476
Total inventories, net $ 48,783 $ 35,649 $ 38,831