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Fixed Assets (Schedule of Depreciation and Amortization of Fixed Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Abstract] |  |  |
Cost of sales | $ 27,042 | $ 22,993 | $ 21,289
Selling, general and administrative expenses | 7,798 | 5,140 | 4,137
Total | $ 34,840 | $ 28,133 | $ 25,426

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- Definition Selling, General And Administrative Expenses. Depreciation And Amortization + References No definition available. + Details
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- Definition Depreciation and amortization of property, plant and equipment directly related to goods produced and sold and services rendered by an entity during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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