Inventories	12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories Inventory costs are determined using the LIFO method for substantially all U.S. inventories. The current cost of the U.S. inventories under the FIFO method was $415,640 and $409,034 at December 31, 2017 and 2016, respectively. These FIFO values have been reduced by approximately $88,094 and $85,113 at December 31, 2017 and 2016, respectively, to arrive at the LIFO value reported on the 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

12 Months Ended

Dec. 31, 2017

Inventory costs are determined using the LIFO method for substantially all U.S. inventories. The current cost of the U.S. inventories under the FIFO method was $415,640 and $409,034 at December 31, 2017 and 2016, respectively. These FIFO values have been reduced by approximately $88,094 and $85,113 at December 31, 2017 and 2016, respectively, to arrive at the LIFO value reported on the 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.