Annual report pursuant to Section 13 and 15(d)

Acquisitions - Results of Operations Since Acquisition (Details)

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Acquisitions - Results of Operations Since Acquisition (Details) - Marcegalia USA, Inc. - Galvanized
12 Months Ended
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]  
Net sales $ 11,876,733
Income before income taxes $ 64,971