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Impairment Goodwill Impairment (Notes)	3 Months Ended
Impairment Goodwill Impairment (Notes)	Mar. 31, 2021
Goodwill Impairment Disclosure [Abstract]
Goodwill Disclosure [Text Block]	The Company assesses its long-lived assets for impairment when events and circumstances indicate that the carrying amount of the assets may not be recoverable. Long-lived assets consist primarily of buildings, machinery and equipment. During the three months ended March 31, 2021, the Company did not identify any indicators of impairment for long-lived assets. The Company annually assesses goodwill for impairment on December 1st of each year or more frequently when events or circumstances indicate that the carrying amount of a reporting unit that includes goodwill exceeds its fair value. The Company evaluated whether triggering events occurred during the three months ended March 31, 2021 and 2020 for all reporting units that include goodwill and determined that triggering events did occur during the first three months of 2020 for the Aluminum Extrusions’ reporting units created as a result of acquisitions in 2012 (“AACOA”) and in 2017 (“Futura”). As a result of the impairment testing performed, the Company recognized a goodwill impairment charge of $13.7 million ($10.5 million after taxes), which represented the entire amount of goodwill associated with the AACOA reporting unit. No impairment was identified for Futura. The Company continues to monitor developments related to the COVID-19 pandemic and may perform updated analyses during 2021 as necessary.