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Inventories
6 Months Ended
Jun. 30, 2014
Inventory Disclosure [Abstract]  
Inventories
6. Inventories

Inventory costs are determined using the last-in, first-out (“LIFO”) method for substantially all U.S. inventories. The current cost of this inventory under the first-in, first-out (“FIFO”) method was $432,906 and $510,199 at December 31, 2013 and June 30, 2014, respectively. These FIFO values have been reduced by approximately $161,436 and $126,374 at December 31, 2013 and June 30, 2014, 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 method. All inventories are stated at the lower of cost or market.