2.4.0.830403 - Disclosure - Asset Retirement Obligations (Tables)truefalsefalse1false falsefalseDuration_1_1_2013_To_6_30_2013http://www.sec.gov/CIK0000750199duration2013-01-01T00:00:002013-06-30T00:00:001true 1us-gaap_AssetRetirementObligationDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Asset Retirement Obligations [Abstract]2false 2us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00<div> <div style="margin-left:0pt;margin-right:0pt;"> <div style="width:100%"><table cellpadding="0" cellspacing="0" style="border-collapse:collapse;width: 100.00%;margin-left:0pt;"> <tr> <td valign="top" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:1pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;height:1pt;overflow:hidden;font-size: 1pt"> <font style="display: inline;font-size:1pt;">&nbsp;</font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:1pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;height:1pt;overflow:hidden;font-size: 12pt"> &nbsp;</p> </td> <td valign="top" style="width:01.66%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:1pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;height:1pt;overflow:hidden;font-size: 12pt"> &nbsp;</p> </td> <td valign="middle" style="width:13.88%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:1pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;height:1pt;overflow:hidden;font-size: 12pt"> &nbsp;</p> </td> </tr> <tr> <td valign="middle" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:13pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">&nbsp;</font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:13pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td colspan="2" valign="bottom" style="width:00.02%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:13pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;text-align:center;font-family:Times New Roman;font-size: 7pt"> <font style="display: inline;font-weight:bold;font-size:7pt;">Six Months Ended</font></p> </td> </tr> <tr> <td valign="middle" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">&nbsp;</font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td colspan="2" valign="bottom" style="width:00.02%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1.5pt solid #000000 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;text-align:center;font-family:Times New Roman;font-size: 7pt"> <font style="display: inline;font-weight:bold;font-size:7pt;">June 30, 2013</font></p> </td> </tr> <tr> <td valign="middle" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">&nbsp;</font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td colspan="2" valign="bottom" style="width:00.02%;border-top:1pt solid #000000 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #auto;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;text-align:center;font-family:Times New Roman;font-size: 7pt"> <font style="display: inline;font-weight:bold;font-size:7pt;">(in thousands)</font></p> </td> </tr> <tr> <td valign="top" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">Balance at December&nbsp;31, 2012</font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt 6pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="top" style="width:01.66%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">$</font></p> </td> <td valign="middle" style="width:13.88%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"><div style="float:left"></div>235,110&nbsp; </td> </tr> <tr> <td valign="top" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">Accretion expense </font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt 6pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="top" style="width:01.66%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="middle" style="width:13.88%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"><div style="float:left"></div>12,198&nbsp; </td> </tr> <tr> <td valign="top" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">Liabilities incurred </font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt 6pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="top" style="width:01.66%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="middle" style="width:13.88%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"><div style="float:left"></div>334&nbsp; </td> </tr> <tr> <td valign="top" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">Revisions </font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt 6pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="top" style="width:01.66%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="middle" style="width:13.88%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"><div style="float:left"></div>10,261&nbsp; </td> </tr> <tr> <td valign="top" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">Liabilities associated with assets sold</font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt 6pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="top" style="width:01.66%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="middle" style="width:13.88%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"><div style="float:left"></div>(3,965) </td> </tr> <tr> <td valign="top" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">Liabilities settled </font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt 6pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="top" style="width:01.66%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1.5pt solid #000000 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="middle" style="width:13.88%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1.5pt solid #000000 ;border-right:1pt none #D9D9D9 ;height:12pt;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"><div style="float:left"></div>(26,771) </td> </tr> <tr> <td valign="top" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">Balance at June 30, 2013</font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt 6pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="top" style="width:01.66%;border-top:1pt solid #000000 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="middle" style="width:13.88%;border-top:1pt solid #000000 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"><div style="float:left"></div>227,167&nbsp; </td> </tr> <tr> <td valign="top" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">Less: End of period, current portion </font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt 6pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="top" style="width:01.66%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1.5pt solid #000000 ;border-right:1pt none #D9D9D9 ;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="middle" style="width:13.88%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1.5pt solid #000000 ;border-right:1pt none #D9D9D9 ;height:12pt;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"><div style="float:left"></div>28,162&nbsp; </td> </tr> <tr> <td valign="top" style="width:82.24%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">End of period, noncurrent portion </font></p> </td> <td valign="middle" style="width:02.22%;border-top:1pt none #D9D9D9 ;border-left:1pt none #D9D9D9 ;border-bottom:1pt none #D9D9D9 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt 6pt;font-family:Times New Roman;font-size: 12pt"> &nbsp;</p> </td> <td valign="top" style="width:01.66%;border-top:1pt solid #000000 ;border-left:1pt none #D9D9D9 ;border-bottom:2pt double #000000 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;padding:0pt;"> <p style="margin:0pt 0pt 0.05pt;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">$</font></p> </td> <td valign="middle" style="width:13.88%;border-top:1pt solid #000000 ;border-left:1pt none #D9D9D9 ;border-bottom:2pt double #000000 ;border-right:1pt none #D9D9D9 ;background-color: #CCEEFF;height:12pt;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"><div style="float:left"></div>199,005&nbsp; </td> </tr> </table></div> <p style="margin:0pt;line-height:normal;font-family:Times New Roman;font-size: 12pt"> <font style="display: inline;">&nbsp;</font> </p> <p><font size="1"> </font></p> </div> </div>falsefalsefalsenonnum:textBlockItemTypenaTabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 false0Schedule of Changes in Asset Retirement ObligationsfalseAsset Retirement Obligations (Tables)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://eplweb.com/role/DisclosureAssetRetirementObligationsTables12