1.0.0.3 false Share-Based Compensation false 1 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 2 Share-Based Compensation [Abstract] 0 esv_ShareBasedPayments esv false na duration string Share-Based Payments [Abstract] false false false false false true false false false 1 false false 0 0 false false Share-Based Payments [Abstract] false 3 Share-Based Compensation 1 us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 <div> <table class="MsoNormalTable" border="0" cellpadding="0" width= "600" style= "width:6.25in; mso-cellspacing:1.5pt;mso-yfti-tbllook:1184"> <tr style="mso-yfti-irow:0;mso-yfti-firstrow:yes"> <td style="padding:.75pt .75pt .75pt .75pt"> <h2> <a name= "_AUC72822e1e4e1444c6922d405459992618"> Note 5 - Share-Based Compensation</a> </h2>        During the quarter ended June 30, 2009, we granted 115,002 share options to certain officers as annual equity awards made pursuant to our 2005 Long-Term Incentive Plan ("LTIP"). The share options granted become exercisable in annual 33% increments over a three-year period and, to the extent not exercised, expire on the seventh anniversary of the date of grant. The following table summarizes the value of share options granted during the quarter ended June 30, 2009 (per share): </td> </tr> <tr style="mso-yfti-irow:1;mso-yfti-lastrow:yes"> <td style="padding:.75pt .75pt .75pt .75pt">   </td> </tr> </table>   <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="500" style= "width:375.0pt;mso-cellspacing:0in;mso-yfti-tbllook:1184;mso-padding-alt: 0in 0in 0in 0in"> <tr style="mso-yfti-irow:0;mso-yfti-firstrow:yes"> <td colspan="3" valign="bottom" style= "padding:0in 0in 0in 0in"></td> <td colspan="3" valign="bottom" style= "padding:0in 0in 0in 0in"></td> </tr> <tr style="mso-yfti-irow:1"> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in"> Weighted-average grant-date fair value </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in">   </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in">   </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in">   </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in"> $17.17 </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in">   </td> </tr> <tr style="mso-yfti-irow:2;mso-yfti-lastrow:yes"> <td width="88%" valign="bottom" style= "width:88.0%;padding:0in 0in 0in 0in"> Weighted-average exercise price </td> <td width="1%" valign="bottom" style= "width:1.0%;padding:0in 0in 0in 0in">   </td> <td width="4%" valign="bottom" style= "width:4.0%;padding:0in 0in 0in 0in">   </td> <td width="5%" valign="bottom" style= "width:5.0%;padding:0in 0in 0in 0in">   </td> <td width="1%" valign="bottom" style= "width:1.0%;padding:0in 0in 0in 0in"> $41.29 </td> <td width="1%" valign="bottom" style= "width:1.0%;padding:0in 0in 0in 0in">   </td> </tr> </table>   <table class="MsoNormalTable" border="0" cellpadding="0" width= "600" style= "width:6.25in; mso-cellspacing:1.5pt;mso-yfti-tbllook:1184"> <tr style="mso-yfti-irow:0;mso-yfti-firstrow:yes"> <td style="padding:.75pt .75pt .75pt .75pt">        The exercise price of share options granted during the period equals the market value of the underlying stock on the date of grant. The fair value of each option award was estimated on the date of grant using the Black-Scholes option valuation model with the following weighted-average assumptions for the quarter ended June 30, 2009: </td> </tr> <tr style="mso-yfti-irow:1;mso-yfti-lastrow:yes"> <td style="padding:.75pt .75pt .75pt .75pt">   </td> </tr> </table>   <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="500" style= "width:375.0pt;mso-cellspacing:0in;mso-yfti-tbllook:1184;mso-padding-alt: 0in 0in 0in 0in"> <tr style="mso-yfti-irow:0;mso-yfti-firstrow:yes"> <td colspan="3" valign="bottom" style= "padding:0in 0in 0in 0in"></td> <td colspan="3" valign="bottom" style= "padding:0in 0in 0in 0in"></td> </tr> <tr style="mso-yfti-irow:1"> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in"> Risk-free interest rate </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in">   </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in">   </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in">   </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in"> 1.8 </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in"> % </td> </tr> <tr style="mso-yfti-irow:2"> <td width="88%" valign="bottom" style= "width:88.0%;padding:0in 0in 0in 0in"> Expected life (in years) </td> <td width="1%" valign="bottom" style= "width:1.0%;padding:0in 0in 0in 0in">   </td> <td width="4%" valign="bottom" style= "width:4.0%;padding:0in 0in 0in 0in">   </td> <td width="5%" valign="bottom" style= "width:5.0%;padding:0in 0in 0in 0in">   </td> <td width="1%" valign="bottom" style= "width:1.0%;padding:0in 0in 0in 0in"> 3.9 </td> <td width="1%" valign="bottom" style= "width:1.0%;padding:0in 0in 0in 0in">   </td> </tr> <tr style="mso-yfti-irow:3"> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in"> Expected volatility </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in">   </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in">   </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in">   </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in"> 53.3 </td> <td valign="bottom" style= "background:#CCEEFF;padding:0in 0in 0in 0in"> % </td> </tr> <tr style="mso-yfti-irow:4;mso-yfti-lastrow:yes"> <td width="88%" valign="bottom" style= "width:88.0%;padding:0in 0in 0in 0in"> Dividend yield </td> <td width="1%" valign="bottom" style= "width:1.0%;padding:0in 0in 0in 0in">   </td> <td width="4%" valign="bottom" style= "width:4.0%;padding:0in 0in 0in 0in">   </td> <td width="5%" valign="bottom" style= "width:5.0%;padding:0in 0in 0in 0in">   </td> <td width="1%" valign="bottom" style= "width:1.0%;padding:0in 0in 0in 0in"> .2 </td> <td width="1%" valign="bottom" style= "width:1.0%;padding:0in 0in 0in 0in"> % </td> </tr> </table>        Expected volatility is based on the historical volatility of our common stock over the period of time equivalent to the expected term of the options granted. The expected term of options granted is derived from historical exercise patterns over a period of time equivalent to the contractual term of the options granted. We have not experienced significant differences in the historical exercise patterns among employees, officers and non-employee directors for them to be considered separately for valuation purposes. The risk-free interest rate is based on the implied yield of U.S. Treasury zero-coupon issues on the date of grant with a remaining term approximating the expected term of the options granted. <span style= "font-size:10.0pt;font-family:Times New Roman,serif;mso-fareast-font-family: Times New Roman;mso-fareast-theme-font:minor-fareast;mso-ansi-language:EN-US; mso-fareast-language:EN-US;mso-bidi-language:AR-SA">       During the quarter ended June 30, 2009, we granted 526,383 non-vested share awards to our employees, officers and non-employee directors for annual equity awards and for equity awards granted to new or recently promoted employees, pursuant to our LTIP. Grants of non-vested share awards generally vest at a rate of 20% per year, as determined by a committee of the Board of Directors. Beginning in June 2009, non-vested share awards granted to certain officers vest at a rate of 33% per year. All non-vested share awards have voting and dividend rights effective on the date of grant and are measured using the market value of our common stock on the date of grant. The weighted-average grant-date fair value of non-vested share awards granted during the quarter ended June 30, 2009 was $40.83 per share. <style> /*<![CDATA[*/  /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;} /*]]>*/ </style> </div> Note 5 - Share-Based Compensation        During the quarter ended June 30, false false No definition available. 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