Related Parties	12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]
Related Parties	NOTE 26. RELATED PARTIES In some markets, we purchase grid products from WAVE, our 50%-owned joint venture with Worthington Industries, for resale to customers. The total amount of these purchases was $18.2 million in 2017, $18.0 million in 2016 and $18.2 million in 2015. We also provide certain selling, promotional and administrative processing services to WAVE for which we receive reimbursement. Those services amounted to $14.9 million in 2017, $9.1 million in 2016, and $8.8 million in 2015. The net amount due to WAVE from us for all of our relationships was $2.6 million as of December 31, 2017 and $4.2 million as of December 31, 2016. See Note 9 to the Consolidated Financial Statements for additional information.

Related Parties

12 Months Ended

Dec. 31, 2017

NOTE 26. RELATED PARTIES

In some markets, we purchase grid products from WAVE, our 50%-owned joint venture with Worthington Industries, for resale to customers. The total amount of these purchases was $18.2 million in 2017, $18.0 million in 2016 and $18.2 million in 2015. We also provide certain selling, promotional and administrative processing services to WAVE for which we receive reimbursement. Those services amounted to $14.9 million in 2017, $9.1 million in 2016, and $8.8 million in 2015. The net amount due to WAVE from us for all of our relationships was $2.6 million as of December 31, 2017 and $4.2 million as of December 31, 2016. See Note 9 to the Consolidated Financial Statements for additional information.