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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventories [Abstract]    
Raw materials and parts $ 146,703 $ 141,967
Work-in-process 120,858 113,859
Finished goods 86,138 104,879
Used equipment 25,778 24,071
Total $ 379,477 $ 384,776