2.4.0.810401 - Disclosure - Asset Retirement Obligationstruefalsefalse1false 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_AssetRetirementObligationDisclosureTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00<div> <div style="margin-left:0pt;margin-right:0pt;"> <p style="margin:9pt 0pt 0pt;border-bottom:1pt none #D9D9D9 ;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-weight:bold;font-size:10pt;">(4) Asset Retirement Obligations </font> </p> <p style="margin:9pt 0pt 0pt;text-indent:24.5pt;border-top:1pt none #D9D9D9 ;font-family:Times New Roman;font-size: 10pt"> <font style="display: inline;font-size:10pt;">The following table reconciles the beginning and ending aggregate recorded amount of our asset retirement obligations. </font> </p> <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:textBlockItemTypenaThe entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Asset Retirement ObligationsfalseAsset Retirement ObligationsUnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://eplweb.com/role/DisclosureAssetRetirementObligations12