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Inventories
6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
3. Inventories

Inventory costs are determined using the last-in, first-out (“LIFO”) method for substantially all U.S. inventories. The current cost of the U.S. inventories under the first-in, first-out (“FIFO”) method was $432,372 and $361,779 at June 30, 2016 and December 31, 2015, respectively. These FIFO values have been reduced by approximately $54,891 and $73,123 at June 30, 2016 and December 31, 2015, respectively, to arrive at the LIFO value reported on the Condensed Consolidated Balance Sheets. The remaining inventories have been valued under the FIFO or average cost methods. All inventories are stated at the lower of cost or market.