Significant Accounting Policies (Notes)	3 Months Ended
Mar. 31, 2018
Significant Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Except for the changes below, no material changes have been made to the company's significant accounting policies disclosed in Note 1, Summary of Significant Accounting Policies, in its Annual Report on Form 10-K, filed on February 6, 2018, for the year ended December 31, 2017. Revenue Recognition Revenue is recognized at the point at which control of the underlying goods or services are transferred to the customer, which included determining whether goods and services are distinct and separate performance obligations, which may require significant judgment. Satisfaction of the company’s performance obligations occur upon the transfer of control of goods or services, either from the company’s facilities or directly from suppliers to customers. The company considers customer purchase orders, which in some cases are governed by master agreements, to be the contracts with a customer. All revenue is generated from contracts with customers. In determining the transaction price, the company evaluates whether the price is subject to refund or adjustment to determine the net consideration to which the company expects to receive. The amount of consideration received and revenue recognized by the company vary due to contractually defined incentives and return rights that are held by customers. These adjustments are made in the same period as the underlying transactions. Investments The change in fair value of equity investments, for which the company does not possess the ability to exercise significant influence, are recognized in net income. The fair value of these equity investments are based upon readily determinable fair values (Note I).

Except for the changes below, no material changes have been made to the company's significant accounting policies disclosed in Note 1, Summary of Significant Accounting Policies, in its Annual Report on Form 10-K, filed on February 6, 2018, for the year ended December 31, 2017.

Revenue Recognition

Revenue is recognized at the point at which control of the underlying goods or services are transferred to the customer, which included determining whether goods and services are distinct and separate performance obligations, which may require significant judgment. Satisfaction of the company’s performance obligations occur upon the transfer of control of goods or services, either from the company’s facilities or directly from suppliers to customers. The company considers customer purchase orders, which in some cases are governed by master agreements, to be the contracts with a customer. All revenue is generated from contracts with customers.

In determining the transaction price, the company evaluates whether the price is subject to refund or adjustment to determine the net consideration to which the company expects to receive. The amount of consideration received and revenue recognized by the company vary due to contractually defined incentives and return rights that are held by customers. These adjustments are made in the same period as the underlying transactions.

Investments

The change in fair value of equity investments, for which the company does not possess the ability to exercise significant influence, are recognized in net income. The fair value of these equity investments are based upon readily determinable fair values (Note I).