Quarterly report pursuant to Section 13 or 15(d)

Inventories Textuals (Details)

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Inventories Textuals (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Inventory lower of cost or market reserve $ 7,477 $ 6,213
Excess of replacement or current costs over stated LIFO value, net of the fair value hedged item $ 2,930 $ 5,236