2.2.0.25falsefalse0201 - Disclosure - General Informationtruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $Jan-01-2011_Mar-31-2011http://www.sec.gov/CIK0001030749duration2011-01-01T00:00:002011-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0glf_GeneralInformationAbstractglffalsenadurationGeneral Information.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringGeneral Information.falsefalseGeneral Information [Abstract]3false0us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00    <div style="font-family: 'Times New Roman',Times,serif"> <div align="center" style="font-size: 10pt; margin-top: 0pt"><b></b> </div> <div align="left"> </div> <div align="center" style="font-size: 10pt"><b></b> <b></b></div> <div align="left" style="font-size: 10pt; margin-top: 12pt"><b>(1) GENERAL INFORMATION</b> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt"><i>Organization and Nature of Operations</i> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">     The condensed consolidated financial statements of GulfMark Offshore, Inc. and its subsidiaries included herein have been prepared by us without audit, pursuant to the rules and regulations of the Securities and Exchange Commission, or SEC. Unless otherwise indicated, references to “we”, “us”, “our” and the “Company” refer collectively to GulfMark Offshore, Inc. and its subsidiaries and predecessors. Certain information relating to our organization and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles, or U.S. GAAP, has been condensed or omitted in this Form 10-Q pursuant to such rules and regulations. However, we believe that the disclosures herein are adequate to make the information presented not misleading. The consolidated balance sheet as of December 31, 2010, has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements. It is recommended that these financial statements be read in conjunction with our consolidated financial statements and notes thereto included in our Form 10-K for the year ended December 31, 2010. </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">     In the opinion of management, all adjustments, which include reclassification and normal recurring adjustments necessary to present fairly the unaudited condensed consolidated financial statements for the periods indicated have been made. All significant intercompany accounts have been eliminated. Certain reclassifications of previously reported information may be made to conform with current year presentation. </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">     We provide offshore marine support and transportation services primarily to companies involved in the offshore exploration and production of oil and natural gas. Our vessels transport materials, supplies and personnel to offshore facilities, as well as move and position drilling structures. The majority of our operations are conducted in the North Sea, offshore Southeast Asia and the Americas. We also contract vessels into other regions to meet our customers’ requirements. </div>   </div>  <div style="font-family: 'Times New Roman',Times,serif"> <div align="left" style="font-size: 10pt; margin-top: 6pt"><i>Earnings Per Share</i> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">     Basic Earnings Per Share, or EPS, is computed by dividing net income (loss) by the weighted average number of shares of Class A Common Stock outstanding during the period. Diluted EPS is computed using the treasury stock method for Class A Common Stock equivalents. The reconciliation between basic and diluted earnings per share from income or loss attributable to Class A Common Stock stockholders, including allocation to participating securities, is as follows: </div> <div align="center"> <table style="font-size: 10pt; text-align: left" cellspacing="0" border="0" cellpadding="0" width="100%">  <tr valign="bottom"> <td width="76%"> </td> <td width="5%"> </td> <td width="1%"> </td> <td width="5%"> </td> <td width="1%"> </td> <td width="5%"> </td> <td width="1%"> </td> <td width="5%"> </td> <td width="1%"> </td> </tr> <tr style="font-size: 8pt" valign="bottom"> <td> </td> <td> </td> <td nowrap="nowrap" align="center" colspan="6"><b>Three Months Ended</b></td> <td> </td> </tr> <tr style="font-size: 8pt" valign="bottom"> <td> </td> <td> </td> <td nowrap="nowrap" align="center" colspan="6" style="border-bottom: 1px solid #000000"><b>March 31,</b></td> <td> </td> </tr> <tr style="font-size: 8pt" valign="bottom"> <td> </td> <td> </td> <td nowrap="nowrap" align="center" colspan="2" style="border-bottom: 1px solid #000000"><b>2011</b></td> <td> </td> <td> </td> <td nowrap="nowrap" align="center" colspan="2" style="border-bottom: 1px solid #000000"><b>2010</b></td> <td> </td> </tr> <tr style="font-size: 8pt" valign="bottom"> <td> </td> <td> </td> <td nowrap="nowrap" align="center" colspan="6"><i>(In thousands, except per share amounts)</i></td> <td> </td> </tr>   <tr valign="bottom" style="background: #cceeff"> <td> <div style="margin-left:15px; text-indent:-15px"><b>Income (loss):</b> </div></td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> </tr> <tr valign="bottom"> <td> <div style="margin-left:30px; text-indent:-15px">Net income (loss) attributable to common stockholders </div></td> <td> </td> <td nowrap="nowrap" align="left">$</td> <td align="right">(1,167</td> <td nowrap="nowrap">)</td> <td> </td> <td align="left">$</td> <td align="right">21,543</td> <td> </td> </tr> <tr valign="bottom" style="background: #cceeff"> <td> <div style="margin-left:30px; text-indent:-15px">Less: Distributions on participating securities </div></td> <td> </td> <td> </td> <td align="right"><b>—</b></td> <td> </td> <td> </td> <td> </td> <td align="right">—</td> <td> </td> </tr> <tr valign="bottom"> <td> <div style="margin-left:30px; text-indent:-15px">Less: Undistributed income allocated to participating securities </div></td> <td> </td> <td> </td> <td align="right"><b>—</b></td> <td> </td> <td> </td> <td> </td> <td align="right">318</td> <td> </td> </tr> <tr style="font-size: 1px"> <td> <div style="margin-left:15px; text-indent:-15px">  </div></td> <td> </td> <td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td> <td> </td> <td> </td> <td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td> <td> </td> </tr> <tr valign="bottom" style="background: #cceeff"> <td> <div style="margin-left:15px; text-indent:-15px">Basic </div></td> <td> </td> <td nowrap="nowrap" align="left">$</td> <td align="right">(1,167</td> <td nowrap="nowrap">)</td> <td> </td> <td align="left">$</td> <td align="right">21,225</td> <td> </td> </tr> <tr style="font-size: 1px"> <td> <div style="margin-left:15px; text-indent:-15px">  </div></td> <td> </td> <td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td> <td> </td> <td> </td> <td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td> <td> </td> </tr> <tr valign="bottom"> <td> <div style="margin-left:15px; text-indent:-15px">Diluted </div></td> <td> </td> <td nowrap="nowrap" align="left">$</td> <td align="right">(1,167</td> <td nowrap="nowrap">)</td> <td> </td> <td align="left">$</td> <td align="right">21,543</td> <td> </td> </tr> <tr style="font-size: 1px"> <td> <div style="margin-left:15px; text-indent:-15px">  </div></td> <td> </td> <td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td> <td> </td> <td> </td> <td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td> <td> </td> </tr> <tr valign="bottom" style="background: #cceeff"> <td> <div style="margin-left:15px; text-indent:-15px"><b>Shares:</b> </div></td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> </tr> <tr valign="bottom"> <td> <div style="margin-left:30px; text-indent:-15px">Basic </div></td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> </tr> <tr valign="bottom" style="background: #cceeff"> <td> <div style="margin-left:45px; text-indent:-15px">Weighted-average common shares outstanding </div></td> <td> </td> <td> </td> <td align="right">25,679</td> <td> </td> <td> </td> <td> </td> <td align="right">25,394</td> <td> </td> </tr> <tr valign="bottom"> <td> <div style="margin-left:45px; text-indent:-15px">Dilutive effect of stock options and restricted stock awards </div></td> <td> </td> <td> </td> <td align="right"><b>—</b></td> <td> </td> <td> </td> <td> </td> <td align="right">150</td> <td> </td> </tr> <tr style="font-size: 1px"> <td> <div style="margin-left:15px; text-indent:-15px">  </div></td> <td> </td> <td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td> <td> </td> <td> </td> <td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td> <td> </td> </tr> <tr valign="bottom" style="background: #cceeff"> <td> <div style="margin-left:30px; text-indent:-15px">Diluted </div></td> <td> </td> <td> </td> <td align="right">25,679</td> <td> </td> <td> </td> <td> </td> <td align="right">25,544</td> <td> </td> </tr> <tr style="font-size: 1px"> <td> <div style="margin-left:15px; text-indent:-15px">  </div></td> <td> </td> <td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td> <td> </td> <td> </td> <td nowrap="nowrap" colspan="2" align="right" style="border-top: 1px solid #000000"> </td> <td> </td> </tr> <tr valign="bottom"> <td> <div style="margin-left:15px; text-indent:-15px"><b>Income (loss) per common share:</b> </div></td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> <td> </td> </tr> <tr valign="bottom" style="background: #cceeff"> <td> <div style="margin-left:30px; text-indent:-15px">Basic </div></td> <td> </td> <td nowrap="nowrap" align="left">$</td> <td align="right">(0.05</td> <td nowrap="nowrap">)</td> <td> </td> <td align="left">$</td> <td align="right">0.84</td> <td> </td> </tr> <tr valign="bottom"> <td> <div style="margin-left:30px; text-indent:-15px">Diluted </div></td> <td> </td> <td nowrap="nowrap" align="left">$</td> <td align="right">(0.05</td> <td nowrap="nowrap">)</td> <td> </td> <td align="left">$</td> <td align="right">0.84</td> <td> </td> </tr>  </table> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">Our basic EPS presentation has been modified to conform with the guidelines set forth in ASC 260 <i>Earnings Per Share </i>concerning unvested share-based payment awards with non-forfeitable rights to receive dividends or dividend. Conforming the presentation had an immaterial impact on our basic EPS in prior periods. </div> </div>  <!-- Begin Block Tagged NotefalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDescription containing the entire organization, consolidation and basis of presentation of financial statements disclosure. 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