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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 539 | $ 601
Accumulated depreciation, Property, plant and equipment | 63,556 | 62,832
Accumulated amortization, Intangible assets | $ 18,875 | $ 17,380
Preferred stock, par value | $ 0.001 | $ 0.001
Preferred stock, shares authorized | 2,000 | 2,000
Preferred stock, shares outstanding | 0 | 0
Common stock, par value | $ 0.001 | $ 0.001
Common stock, shares authorized | 150,000 | 150,000
Common stock, shares issued | 53,379 | 53,165
Common stock, shares outstanding | 53,379 | 53,165

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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