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Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Common stock, par value | $ 0 | $ 0
Authorized shares | 115,000 | 115,000
Common stock, shares outstanding | 73,240 | 73,020

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + 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 + Details
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