Quarterly report pursuant to Section 13 or 15(d)

Inventories Textuals (Details)

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Inventories Textuals (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Excess of Replacement or Current Costs over Stated LIFO Value $ 6,402 $ 4,390
Excess of Replacement or Current Costs over Stated LIFO Value, Net of the Fair Value Hedged Items $ 13,100 $ 13,154