XML 117 R96.htm IDEA: XBRL DOCUMENT v3.8.0.1
INVENTORY (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw materials $ 97,577 $ 76,811
Work-in-process 50,695 40,556
Finished goods 200,395 138,039
Inventory, Net $ 348,667 $ 255,406
Percentage of total inventories valued using the LIFO method (as a percent) 32.00% 40.00%
Excess of current cost over LIFO cost $ 68,641 $ 61,329