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Acquisition (Pro Forma Results) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Acquisition [Abstract] |  |
Sales | $ 191,187 | $ 182,175
Net income (loss) | $ 6,604 | $ (1,736)
Net income (loss) per share - basic | $ 0.22 | $ (0.06)
Net income (loss) per share - diluted | $ 0.22 | $ (0.06)

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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