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Long-Term Debt (Details) (USD $) | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Partnership's 6% senior notes due April 2021 | Mar. 31, 2013 Partnership's 6% senior notes due April 2021 | Sep. 30, 2013 4.25% convertible senior notes due June 2014 | Dec. 31, 2012 4.25% convertible senior notes due June 2014 | Jan. 31, 2013 4.75% convertible senior notes due January 2014 | Dec. 31, 2012 4.75% convertible senior notes due January 2014 | Sep. 30, 2013 7.25% senior notes due December 2018 | Dec. 31, 2012 7.25% senior notes due December 2018 | Sep. 30, 2013 Other, interest at various rates, collateralized by equipment and other assets | Sep. 30, 2013 Revolving credit facility due July 2016 | Dec. 31, 2012 Revolving credit facility due July 2016 | Dec. 31, 2012 Partnership's revolving credit facility due November 2015 | Dec. 31, 2012 Partnership's term loan facility due November 2015 | Sep. 30, 2013 Partnership's revolving credit facility due May 2018 | Sep. 30, 2013 Partnership's term loan facility due May 2018
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Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 1,564,308,000 | $ 1,564,923,000 | $ 344,818,000 |  | $ 337,720,000 | $ 320,673,000 |  | $ 143,750,000 | $ 350,000,000 | $ 350,000,000 | $ 270,000 | $ 156,500,000 | $ 70,000,000 | $ 530,500,000 | $ 150,000,000 | $ 225,000,000 | $ 150,000,000
Interest rate (as a percent) |  |  | 6.00% |  | 4.25% | 4.25% | 4.75% | 4.75% | 7.25% | 7.25% |  |  |  |  |  |  |
Amount of unamortized discount of notes |  |  | $ 5,200,000 | $ 5,500,000 | $ 17,300,000 | $ 34,300,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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