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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Items, Net Of Reserves Alternative [Abstract]  
Inventory, Net of Reserves

Inventories are classified as follows (in thousands):

December 31,
20172016
Raw materials$99,033$95,430
Work in progress15,32416,585
Finished goods155,937150,667
Total inventories$270,294$262,682