Annual report pursuant to Section 13 and 15(d)

Inventories - Narratives (Details)

v3.8.0.1
Inventories - Narratives (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Business Combinations    
Inventory    
Difference in LIFO and FIFO inventory valuation $ 26,630 $ 30,338