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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventories [Abstract]    
Raw materials and parts $ 171,713 $ 146,144
Work-in-process 148,146 129,441
Finished goods 71,167 94,571
Used equipment 20,133 21,223
Total $ 411,159 $ 391,379