1.0.0.3 false Stockholders' Equity 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 Stockholders' Equity [Abstract] 0 esv_StockholdersEquityBlock esv false na duration string Stockholders' Equity [Abstract] false false false false false true false false false 1 false false 0 0 false false Stockholders' Equity [Abstract] false 3 Stockholders' Equity 1 us-gaap_StockholdersEquityNoteDisclosureTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 <div><!-- 2.0.3575.42361 --><div><!-- body --><h2 style="margin-right: 0in; margin-left: 0in; font-size: 18.0pt; font-family: 'Times New Roman','serif';"><a name="_AUC6e605a3c779b41b38fe9de0affb2b8e4"><font style="font-size: 10.0pt;" class="_mt">Note 5 - Stockholders' Equity</font></a></h2> <font class="_mt"><font style="font-size: 10.0pt; font-family: 'Times New Roman','serif';" class="_mt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In August 2009, under authorization from our Board of Directors, 40.2 million treasury shares with a historical cost totaling $1,203.7 million were retired. As of September 30, 2009 and December 31, 2008, our treasury stock balance totaled $2.2 million and $1,199.5 million, respectively, our additional paid-in capital balance totaled $594.0 million and $1,761.2 million, respectively, and our common stock balance totaled $14.3 million and $18.2 million, respectively.<!--EndFragment--></font></font><!-- body --></div></div> Note 5 - Stockholders' Equity &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In August 2009, under authorization from our Board of Directors, 40.2 million treasury false false No definition available. No authoritative reference available. false false 1 2 false UnKnown UnKnown UnKnown false true