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Description of the Business and Summary of Significant Accounting Policies (Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill
Goodwill	$ 502,067	$ 453,835
Goodwill impairment loss	0	0	$ 0
Compensation expense for stock-based employee compensation plan	69,200	80,200	$ 50,700
Steel Operations
Goodwill
Goodwill	272,133	272,133
Metals Recycling Operations
Goodwill
Goodwill	228,009	179,777
Metals Recycling Operations | OmniSource
Goodwill
Goodwill decrease due to tax benefit related to the normal amortization of the component	3,000
Goodwill impaired accumulated impairment loss	346,800	346,800
Steel Fabrication Operations
Goodwill
Goodwill	$ 1,925	$ 1,925

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