Impairment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020
Impaired Long-Lived Assets Held and Used [Line Items]
Goodwill, Impairment Loss	$ (13,696)	$ 0
Aluminum Extrusions [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Goodwill, Impairment Loss	13,696	$ 0
Goodwill, Impairment Loss, Net of Tax	10,500
AACOA | Aluminum Extrusions [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Goodwill, Impairment Loss	$ (13,700)
AACOA | Aluminum Extrusions [Member] | Original Budget [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Goodwill, Impairment Loss			$ (9,700)
AACOA | Aluminum Extrusions [Member] | Revised COVID-19 Budget [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Goodwill, Impairment Loss			$ (1,000)