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Other Assets (Schedule of Other Assets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Finite-Lived Intangible Assets [Line Items] |  |
Patents, at cost | $ 6,113 us-gaap_FiniteLivedPatentsGross | $ 5,401 us-gaap_FiniteLivedPatentsGross
Deposits on capital items | 19,011 us-gaap_DepositAssets | 14,091 us-gaap_DepositAssets
Software development costs, at cost | 2,057 us-gaap_FiniteLivedIntangibleAssetsNet | 2,057 us-gaap_FiniteLivedIntangibleAssetsNet
Investment in equity securities |  | 259 us-gaap_EquityMethodInvestments
Other | 3,111 us-gaap_OtherAssetsMiscellaneous | 700 us-gaap_OtherAssetsMiscellaneous
Other assets | 25,547 us-gaap_OtherAssetsNoncurrent | 18,464 us-gaap_OtherAssetsNoncurrent
Patents [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | (3,364)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | (3,075)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Software development [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | $ (1,381)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_SoftwareDevelopmentMember | $ (969)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_SoftwareDevelopmentMember

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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=26713463&loc=d3e16323-109275 + Details
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