Goodwill and Intangible Assets	12 Months Ended
Goodwill and Intangible Assets	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill. We had goodwill of $37.2 million at both December 31, 2016 and December 31, 2015. Such goodwill is related to our acquisitions of the Chandler, Arizona (Extrusion) facility and the Florence, Alabama facility and is included in the Fabricated Products segment. During our annual goodwill impairment test in the quarter ending December 31, 2016, we performed a quantitative impairment test and determined that no impairment of our goodwill was required. Intangible Assets. In 2016 and 2015, our identifiable intangible assets were related to customer relationships. The original cost of these customer relationships was $38.5 million and accumulated amortization and net book value were $9.5 million and $26.4 million, respectively, at December 31, 2016, and $8.0 million and $30.5 million, respectively, at December 31, 2015. The end of a customer relationship during the quarter ended September 30, 2016 triggered an evaluation of one of our customer relationship intangible assets. The evaluation indicated that the carrying value of this customer relationship intangible asset exceeded its estimated fair value as determined by future discounted cash flows. As such, we recorded a non-cash impairment charge of $2.6 million during the quarter ended September 30, 2016 within Other operating charges, net. Other than the impairment discussed above, we identified no other indicators of impairment associated with the remainder of our intangible assets during the year ended December 31, 2016. Amortization expense relating to definite-lived intangible assets is recorded in the Fabricated Products segment. Such expense was $1.5 million for 2016 and $1.6 million for both 2015 and 2014. The expected amortization of intangible assets for each of the next five calendar years is $1.4 million and $19.4 million for years thereafter.

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.