Revenue	9 Months Ended
Sep. 30, 2018
Revenue From Contract With Customer [Abstract]
Revenue	2. Revenue Adoption of ASC Topic 606, Revenue from Contracts with Customers On January 1, 2018, the Company adopted ASC Topic 606 using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under ASC Topic 606, while prior period amounts were not adjusted and continue to be reported in accordance with ASC Topic 605, “Revenue Recognition”. The adoption of ASC Topic 606 resulted in $2 million additional receivables and deferred revenue related to the recognition of receivables with unconditional right to payment. Revenue Recognition The Company’s primary source of revenue is the sale of energy products and an extensive selection of products for industrial applications based upon purchase orders or contracts with customers. The majority of revenue is recognized at a point in time once the Company has determined that the customer has obtained control over the product. Control is typically deemed to have been transferred to the customer when the product is shipped, delivered, or picked up by the customer. The Company does not grant extended payment terms. Revenue is recognized net of any taxes collected from customers, which are subsequently remitted to government authorities. Shipping and handling costs for product shipments occur prior to the customer obtaining control of the goods, and are recorded in cost of products. The amount of revenue recognized reflects the consideration to which the Company expects to be entitled to receive in exchange for products sold. Revenue is recorded at the transaction price net of estimates of variable consideration, which may include product returns, trade discounts and allowances. The Company accrues for variable consideration using the expected value method. Estimates of variable consideration are included in revenue to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur. See Note 7 “Business Segments” for disaggregation of revenue by reporting segments. The Company believes this disaggregation best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. Remaining Performance Obligations Remaining performance obligations represent the transaction price of firm orders for which work has not been performed on contracts with an original expected duration of one year or more. The Company’s contracts are predominantly short-term in nature with a contract term of one year or less. For those contracts, the Company has utilized the practical expedient in ASC Topic 606 exempting the Company from disclosure of the transaction price allocated to remaining performance obligations if the performance obligation is part of a contract that has an original expected duration of one year or less. Receivables Receivables are recorded when the Company has an unconditional right to consideration. Contract Assets and Liabilities Contract assets primarily consist of retainage amounts held as a form of security by customers until the Company satisfies its remaining performance obligations. These assets were de minimis for the nine months ended September 30, 2018 and were included in receivables, net in the consolidated balance sheets. The Company applied the practical expedient to recognize the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset that the entity otherwise would have recognized is one year or less. These expenses were not material for the three and nine months ended September 30, 2018. Contract liabilities primarily consist of deferred revenues recorded when customer payments are received or due in advance of satisfying performance obligations, including amounts which are refundable, and other accrued customer liabilities. Revenue recognition is deferred to a future period until the Company completes its obligations contractually agreed with customers. Approximately $12 million of revenue that was deferred at the beginning of the period was recognized as revenue during the nine months ended September 30, 2018.

2. Revenue

Adoption of ASC Topic 606, Revenue from Contracts with Customers

On January 1, 2018, the Company adopted ASC Topic 606 using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under ASC Topic 606, while prior period amounts were not adjusted and continue to be reported in accordance with ASC Topic 605, “Revenue Recognition”. The adoption of ASC Topic 606 resulted in $2 million additional receivables and deferred revenue related to the recognition of receivables with unconditional right to payment.

Revenue Recognition

The Company’s primary source of revenue is the sale of energy products and an extensive selection of products for industrial applications based upon purchase orders or contracts with customers. The majority of revenue is recognized at a point in time once the Company has determined that the customer has obtained control over the product. Control is typically deemed to have been transferred to the customer when the product is shipped, delivered, or picked up by the customer. The Company does not grant extended payment terms. Revenue is recognized net of any taxes collected from customers, which are subsequently remitted to government authorities. Shipping and handling costs for product shipments occur prior to the customer obtaining control of the goods, and are recorded in cost of products.

The amount of revenue recognized reflects the consideration to which the Company expects to be entitled to receive in exchange for products sold. Revenue is recorded at the transaction price net of estimates of variable consideration, which may include product returns, trade discounts and allowances. The Company accrues for variable consideration using the expected value method. Estimates of variable consideration are included in revenue to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur.

See Note 7 “Business Segments” for disaggregation of revenue by reporting segments. The Company believes this disaggregation best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors.

Remaining Performance Obligations

Remaining performance obligations represent the transaction price of firm orders for which work has not been performed on contracts with an original expected duration of one year or more. The Company’s contracts are predominantly short-term in nature with a contract term of one year or less. For those contracts, the Company has utilized the practical expedient in ASC Topic 606 exempting the Company from disclosure of the transaction price allocated to remaining performance obligations if the performance obligation is part of a contract that has an original expected duration of one year or less.

Receivables

Receivables are recorded when the Company has an unconditional right to consideration.

Contract Assets and Liabilities

Contract assets primarily consist of retainage amounts held as a form of security by customers until the Company satisfies its remaining performance obligations. These assets were de minimis for the nine months ended September 30, 2018 and were included in receivables, net in the consolidated balance sheets. The Company applied the practical expedient to recognize the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset that the entity otherwise would have recognized is one year or less. These expenses were not material for the three and nine months ended September 30, 2018.

Contract liabilities primarily consist of deferred revenues recorded when customer payments are received or due in advance of satisfying performance obligations, including amounts which are refundable, and other accrued customer liabilities. Revenue recognition is deferred to a future period until the Company completes its obligations contractually agreed with customers. Approximately $12 million of revenue that was deferred at the beginning of the period was recognized as revenue during the nine months ended September 30, 2018.