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Acquisitions and Investments (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 03, 2020
Mar. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Jan. 31, 2022
Dec. 31, 2021
Acquisition            
Purchase price paid in cash     $ 60,012 $ 97,106    
Goodwill     $ 457,226     $ 453,835
New Process Steel LP            
Acquisition            
Minority equity interest acquired         45.00%  
United Steel Supply, LLC            
Acquisition            
Acquisition of interest (as a percent)   75.00%        
Purchase price paid in cash   $ 97,100        
United Steel Supply, LLC | Option to Purchase Remaining Equity Interest After Third Anniversary [Member]            
Acquisition            
Percentage of voting equity interests remaining available   12.50%        
United Steel Supply, LLC | Option to Purchase Remaining Equity Interest After Fourth Anniversary [Member]            
Acquisition            
Percentage of voting equity interests remaining available   12.50%        
Zimmer, S.A. de C.V.            
Acquisition            
Acquisition of interest (as a percent) 100.00%          
Purchase price paid in cash $ 60,000