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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2017
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 nine months ended September 30, 2017, by segment is as follows (in thousands):
|  | Steel Mills |  |  | Steel Products |  |  | Raw Materials |  |  | Total |
Balance at December 31, 2016 |  | $ | 620,156 |  |  | $ | 702,995 |  |  | $ | 729,577 |  |  | $ | 2,052,728 |
Acquisitions |  |  | 125,328 |  |  |  | 7,157 |  |  |  | — |  |  |  | 132,485 |
Translation |  |  | — |  |  |  | 23,033 |  |  |  | — |  |  |  | 23,033 |
Balance at September 30, 2017 |  | $ | 745,484 |  |  | $ | 733,185 |  |  | $ | 729,577 |  |  | $ | 2,208,246 |
Schedule of Intangible Assets | Intangible assets with estimated useful lives of five to 22 years are amortized on a straight-line or accelerated basis and were comprised of the following as of September 30, 2017 and December 31, 2016 (in thousands):
|  | September 30, 2017 |  |  | December 31, 2016 |
|  | Gross Amount |  |  | Accumulated Amortization |  |  | Gross Amount |  |  | Accumulated Amortization |
Customer relationships |  | $ | 1,422,569 |  |  | $ | 622,440 |  |  | $ | 1,295,803 |  |  | $ | 566,884 |
Trademarks and trade names |  |  | 176,950 |  |  |  | 74,551 |  |  |  | 161,851 |  |  |  | 66,494 |
Other |  |  | 62,807 |  |  |  | 25,030 |  |  |  | 62,807 |  |  |  | 20,248 |
|  | $ | 1,662,326 |  |  | $ | 722,021 |  |  | $ | 1,520,461 |  |  | $ | 653,626 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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