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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Inventories [Abstract]    
Raw materials and parts $ 141,967 $ 149,171
Work-in-process 113,859 105,163
Finished goods 104,879 102,235
Used equipment 24,071 31,266
Total $ 384,776 $ 387,835