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Other Assets (Schedule of Other Assets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Patents, at cost | $ 5,021 | $ 4,900 |
Deposits on capital items | 3,934 | 1,618 |
Software development costs | 2,057 | 2,057 |
Investment in equity securities, equity method | 125 | 969 |
Investment in equity securities, carried at cost | 1,206 |  |
Other | 549 | 474 |
Other assets | 9,568 | 7,289 |
Patents [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated amortization | (2,826) | (2,583) | (200)
Software development [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated amortization | $ (498) | $ (146) |

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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of the costs pertaining to the exclusive legal rights granted to the owner of the patent to exploit an invention or a process for a period of time specified by law. Such costs may have been expended to directly apply and receive patent rights, or to acquire such rights. + 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)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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