Inventories	3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]
Inventories	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 $485,842 and $415,640 at March 31, 2018 and December 31, 2017, respectively. These FIFO values have been reduced by approximately $78,194 and $88,094 at March 31, 2018 and December 31, 2017, respectively, to arrive at the LIFO value reported on the Condensed Consolidated Balance Sheets. The remaining inventories have been valued under the FIFO method. All LIFO inventories are stated at the lower of cost or market. All other inventories are stated at the lower of cost or net realizable value.

Inventories

3 Months Ended

Mar. 31, 2018

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 $485,842 and $415,640 at March 31, 2018 and December 31, 2017, respectively. These FIFO values have been reduced by approximately $78,194 and $88,094 at March 31, 2018 and December 31, 2017, respectively, to arrive at the LIFO value reported on the Condensed Consolidated Balance Sheets. The remaining inventories have been valued under the FIFO method. All LIFO inventories are stated at the lower of cost or market. All other inventories are stated at the lower of cost or net realizable value.