2.4.0.81100 - Disclosure - Long-Term Debttruefalsefalse1false falsefalseD2013Q2YTDhttp://www.sec.gov/CIK0001166036duration2013-01-01T00:00:002013-06-30T00:00:001true 1us-gaap_DebtDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Long-Term Debt2false 2us-gaap_DebtDisclosureTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-size:10.0pt;font-family:Times New Roman;"> 10. Long-Term Debt   Debt is summarized below (in thousands):   <table style="text-align:left;WIDTH: 86.66%; BORDER-COLLAPSE: collapse; MARGIN-LEFT: 0.5in;" border="0" cellspacing="0" cellpadding="0" width="86%"> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="65%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in;" valign="bottom" width="13%" colspan="2"> June 30, 2013</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in;" valign="bottom" width="13%" colspan="2"> December 31, 2012</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="1%">  </td></tr> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="65%"> Credit Facility</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="13%" colspan="2">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="13%" colspan="2">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="1%">  </td></tr> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="65%"> Credit Facility, variable interest, due September 2017 (1)</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.3%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="1%"> $</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12.54%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="12%"> —</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.3%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="1%"> $</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12.54%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="12%"> —</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="1%">  </td></tr> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="65%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="13%" colspan="2">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="13%" colspan="2">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="1%">  </td></tr> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="65%"> Senior Notes (2)</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="13%" colspan="2">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="13%" colspan="2">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="1%">  </td></tr> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="65%"> 2018 Senior Notes, 8.75% interest, net of discount of zero and $109, respectively, issued April and May 2008</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="13%" colspan="2"> —</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="13%" colspan="2"> 81,003</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="1%">  </td></tr> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="65%"> 2020 Senior Notes, 6.75% interest, issued November 2010 and due November 2020</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="13%" colspan="2"> 500,000</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="13%" colspan="2"> 500,000</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="1%">  </td></tr> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="65%"> 2021 Senior Notes, 6.5% interest, net of discount of $505 and $826, respectively, issued February and March 2011 and due August 2021</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="13%" colspan="2"> 324,495</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="13%" colspan="2"> 499,174</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="1%">  </td></tr> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="65%"> 2022 Senior Notes, 6.25% interest, issued October 2011 and due June 2022</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="13%" colspan="2"> 455,000</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="13%" colspan="2"> 700,000</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="1%">  </td></tr> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="65%"> 2023A Senior Notes, 5.5% interest, net of discount of $6,791 and $7,126, respectively, issued August 2012 and due February 2023</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="13%" colspan="2"> 743,209</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="13%" colspan="2"> 742,874</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="1%">  </td></tr> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="65%"> 2023B Senior Notes, 4.5% interest, issued January 2013 and due July 2023</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in;" valign="bottom" width="13%" colspan="2"> 1,000,000</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 13.84%; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in;" valign="bottom" width="13%" colspan="2"> —</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; PADDING-TOP: 0in;" valign="bottom" width="1%">  </td></tr> <tr style="padding:0;"> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 65.4%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="65%"> Total long-term debt</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: windowtext 2.25pt double; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.3%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="1%"> $</td> <td style="BORDER-BOTTOM: windowtext 2.25pt double; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12.54%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="12%"> 3,022,704</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 2.88%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="2%">  </td> <td style="BORDER-BOTTOM: windowtext 2.25pt double; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.3%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="1%"> $</td> <td style="BORDER-BOTTOM: windowtext 2.25pt double; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 12.54%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="12%"> 2,523,051</td> <td style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; WIDTH: 1.16%; PADDING-RIGHT: 0in; BACKGROUND: #cceeff; PADDING-TOP: 0in;" bgcolor="#CCEEFF" valign="bottom" width="1%">  </td></tr></table> <div> <div>   <div>  </div></div></div> (1)         Applicable interest rate was 5.00% at June 30, 2013. (2)         The estimated aggregate fair value of the senior notes (collectively, the “Senior Notes”) was approximately $2,989.9 million and $2,763 million as of June 30, 2013 and December 31, 2012, respectively, based on quoted prices in an inactive market. The fair value of the Partnership’s Senior Notes is considered a Level 3 measurement.   Credit Facility   Under the provisions of the Credit Facility, the Partnership is subject to a number of restrictions and covenants. These covenants are used to calculate the available borrowing capacity on a quarterly basis. The Credit Facility is guaranteed by the Partnership’s 100% owned subsidiaries, other than MarkWest Liberty Midstream and its subsidiaries, and collateralized by substantially all of the Partnership’s assets and those of its 100% owned subsidiaries, other than MarkWest Liberty Midstream and its subsidiaries. As of June 30, 2013, the Partnership had no borrowings outstanding and approximately $11.3 million of letters of credit outstanding under the Credit Facility, leaving approximately $1,188.7 million of unused capacity of which approximately $271.5  million was available for borrowing based on financial covenant requirements.  Additionally, the full amount of unused capacity is available for borrowing on a short term basis to provide financial flexibility within a given fiscal quarter.   Senior Notes   In January 2013, the Partnership completed a public offering for $1 billion in aggregate principal amount of 4.5% senior unsecured notes due July 2023. The Partnership received net proceeds of approximately $986.0 million after deducting underwriters’ and third-party expenses. A portion of the proceeds, together with cash on hand, was used to repurchase $81.1 million aggregate principal amount of the Partnership’s 8.75% senior notes due April 2018, $175.0 million of the outstanding principal amount of the Partnership’s 6.5% senior notes due August 2021 and $245 million of the outstanding principal amount of the Partnership’s 6.25% senior notes due June 2022, with the remainder used to fund the Partnership’s capital expenditure program and for general partnership purposes. The Partnership recorded a total pre-tax loss of approximately $38.5 million related to the repurchases. The pre-tax loss consisted of approximately $7.0 million related to the non-cash write-off of the unamortized discount and deferred finance costs and approximately $31.5 million related to the payment of redemption premiums.   </div>falsefalsefalsenonnum:textBlockItemTypenaThe entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 false0Long-Term DebtfalseLong-Term DebtUnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.markwest.com/role/DisclosureLongTermDebt12