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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventories [Abstract]    
Raw materials and parts $ 176,938 $ 173,919
Work-in-process 73,629 69,718
Finished goods 82,594 89,152
Used equipment 27,722 23,155
Total $ 360,883 $ 355,944