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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Change in Net Carrying Amount of Goodwill by Segment | The change in the net carrying amount of goodwill for the years ended December 31, 2020 and 2019 by segment is as follows:
|  | (in thousands) |
|  | Steel |  |  | Steel |  |  | Raw |  |  |  |  |
|  | Mills |  |  | Products |  |  | Materials |  |  | Total |
Balance, December 31, 2018 |  | $ | 591,986 |  |  | $ | 862,773 |  |  | $ | 729,577 |  |  | $ | 2,184,336 |
Acquisitions |  |  | — |  |  |  | 12,623 |  |  |  | — |  |  |  | 12,623 |
Translation |  |  | — |  |  |  | 4,104 |  |  |  | — |  |  |  | 4,104 |
Balance, December 31, 2019 |  |  | 591,986 |  |  |  | 879,500 |  |  |  | 729,577 |  |  |  | 2,201,063 |
Acquisitions |  |  | 20,484 |  |  |  | (821 | ) |  |  | — |  |  |  | 19,663 |
Translation |  |  | — |  |  |  | 8,946 |  |  |  | — |  |  |  | 8,946 |
Balance, December 31, 2020 |  | $ | 612,470 |  |  | $ | 887,625 |  |  | $ | 729,577 |  |  | $ | 2,229,672 |
Schedule of Intangible Assets |
|  | (in thousands) |
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | Gross |  |  | Accumulated |  |  | Gross |  |  | Accumulated |
|  | Amount |  |  | Amortization |  |  | Amount |  |  | Amortization |
Customer relationships |  | $ | 1,421,962 |  |  | $ | 838,443 |  |  | $ | 1,412,954 |  |  | $ | 767,532 |
Trademarks and trade names |  |  | 162,365 |  |  |  | 100,000 |  |  |  | 162,183 |  |  |  | 92,258 |
Other |  |  | 63,822 |  |  |  | 41,685 |  |  |  | 63,807 |  |  |  | 36,968 |
|  | $ | 1,648,149 |  |  | $ | 980,128 |  |  | $ | 1,638,944 |  |  | $ | 896,758 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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