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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventories [Abstract]    
Raw materials and parts $ 137,763 $ 141,967
Work-in-process 115,613 113,859
Finished goods 84,898 104,879
Used equipment 22,130 24,071
Total $ 360,404 $ 384,776