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Acquisitions (Schedule of Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 29, 2018
Dec. 31, 2017
Acquisition      
Goodwill $ 429,645   $ 386,893
Companhia Siderurgica Nacional Llc. Heartland      
Acquisition      
Current assets, net of cash acquired   $ 123,443  
Property, plant & equipment   319,736  
Intangible assets   41,200  
Goodwill   46,143  
Total assets acquired   530,522  
Liabilities   96,524  
Net assets acquired   433,998  
Companhia Siderurgica Nacional Llc. Heartland | Restatement Adjustment [Member]      
Acquisition      
Current assets, net of cash acquired   (3,562)  
Property, plant & equipment   52,845  
Intangible assets   41,200  
Goodwill   (76,934)  
Total assets acquired   13,549  
Liabilities   21,611  
Net assets acquired   (8,062)  
Companhia Siderurgica Nacional Llc. Heartland | Scenario Previously Reported [Member]      
Acquisition      
Current assets, net of cash acquired   127,005  
Property, plant & equipment   266,891  
Goodwill   123,077  
Total assets acquired   516,973  
Liabilities   74,913  
Net assets acquired   $ 442,060