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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2014
Inventory, Net [Abstract] |
Schedule of Inventories | Inventories, at December 31, consist of the following:
| 2014 | 2013
Raw materials | $ | 78,599 |  | $ | 69,776 |
Work-in-process | 33,941 |  | 22,183 |
Finished goods | 19,969 |  | 17,661 |
Operating and other supplies | 150,971 |  | 129,995 |
Inventories (1) | $ | 283,480 |  | $ | 239,615 |
(1) | Includes inventory acquired in connection with the Mt. Holly acquisition. See Note 2 Business acquisitions for additional information about the Mt. Holly acquisition.

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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