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Acquisition (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 03, 2020
Mar. 01, 2019
Jun. 29, 2018
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Acquisition                
Purchase price paid in cash           $ 60,012 $ 97,106 $ 433,998
Goodwill         $ 457,226 457,226 452,915  
United Steel Supply, LLC                
Acquisition                
Acquisition of interest (as a percent)   75.00%            
Purchase price paid in cash   $ 93,400            
Percentage of voting equity interests remaining available   25.00%            
Customary working capital transaction purchase price adjustment       $ 3,700        
Companhia Siderurgica Nacional Llc. Heartland                
Acquisition                
Acquisition of interest (as a percent)     100.00%          
Purchase price paid in cash     $ 396,400          
Customary working capital transaction purchase price adjustment     $ 37,600          
Zimmer, S.A. de C.V.                
Acquisition                
Acquisition of interest (as a percent) 100.00%              
Purchase price paid in cash $ 59,000              
Customary working capital transaction purchase price adjustment         1,000      
Current and noncurrent assets, net of cash acquired 31,900              
Property plant and equipment 18,300              
Intangible assets 25,700              
Goodwill 7,700              
Liabilities assumed $ 23,600              
Metals Recycling Operations                
Acquisition                
Goodwill         183,168 183,168 $ 178,857  
Metals Recycling Operations | Zimmer, S.A. de C.V.                
Acquisition                
Goodwill         $ 7,700 $ 7,700    
Customer, vendor and scrap generator relationships | Zimmer, S.A. de C.V.                
Acquisition                
Useful life           15 years