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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventories [Abstract]    
Raw materials $ 38,651 $ 38,383
Work in process 4,143 3,109
Finished goods and parts 62,311 61,839
Inventories, net $ 105,105 $ 103,331