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Long-Term Debt (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 4.25% convertible senior notes due June 2014 | Dec. 31, 2011 4.25% convertible senior notes due June 2014 | Jun. 30, 2009 4.25% convertible senior notes due June 2014 | Dec. 31, 2012 4.75% convertible senior notes due January 2014 | Dec. 31, 2011 4.75% convertible senior notes due January 2014 | Dec. 31, 2003 4.75% convertible senior notes due January 2014 | Dec. 31, 2012 7.25% senior notes due December 2018 | Dec. 31, 2011 7.25% senior notes due December 2018 | Nov. 30, 2010 7.25% senior notes due December 2018 | Dec. 31, 2011 Other, interest at various rates, collateralized by equipment and other assets | Dec. 31, 2012 Revolving credit facility due July 2016 | Dec. 31, 2011 Revolving credit facility due July 2016 | Dec. 31, 2012 Partnership's revolving credit facility due November 2015 | Dec. 31, 2011 Partnership's revolving credit facility due November 2015 | Dec. 31, 2012 Partnership's term loan facility due November 2015 | Dec. 31, 2011 Partnership's term loan facility due November 2015
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Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 1,564,923,000 | $ 1,773,039,000 | $ 320,673,000 | $ 300,149,000 |  | $ 143,750,000 | $ 143,750,000 |  | $ 350,000,000 | $ 350,000,000 |  | $ 140,000 | $ 70,000,000 | $ 433,500,000 | $ 530,500,000 | $ 395,500,000 | $ 150,000,000 | $ 150,000,000
Interest rate (as a percent) |  |  | 4.25% |  | 4.25% | 4.75% |  | 4.75% | 7.25% |  | 7.25% |  |  |  |  |  |  |
Amount of unamortized discount of notes |  |  | $ 34,300,000 | $ 54,900,000 | $ 97,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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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 AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -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 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
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