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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2015
Inventory Disclosure [Abstract] |
Schedule of inventories | Inventories consisted of the following:
| December 31,
| 2015 |  | 2014
| (in thousands)
Finished goods | $ | 9,589 |  |  | $ | 12,393 |
Raw materials and precious metals | 9,055 |  |  | 9,333 |
Parts and supplies | 18,885 |  |  | 13,888 |
| $ | 37,529 |  |  | $ | 35,614 |

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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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