XML 86 R72.htm IDEA: XBRL DOCUMENT v3.8.0.1
Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory [Line Items]    
Finished goods $ 46,365 $ 54,357
Work in process 54,084 57,076
Raw materials 34,220 38,273
Supplies 531 42
Inventory, Net $ 135,200 $ 149,748