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Long-Term Debt (Details) (USD $) | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Partnership's 6% senior notes due April 2021 | Mar. 31, 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 | Mar. 31, 2013 7.25% senior notes due December 2018 | Dec. 31, 2012 7.25% senior notes due December 2018 | Mar. 31, 2013 Other, interest at various rates, collateralized by equipment and other assets | Mar. 31, 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 | Mar. 31, 2013 Partnership's revolving credit facility due May 2018 | Mar. 31, 2013 Partnership's term loan facility due May 2018
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 1,629,654,000 | $ 1,564,923,000 | $ 344,548,000 | $ 326,228,000 | $ 320,673,000 |  | $ 143,750,000 | $ 350,000,000 | $ 350,000,000 | $ 378,000 | $ 220,500,000 | $ 70,000,000 | $ 530,500,000 | $ 150,000,000 | $ 238,000,000 | $ 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 |  |  | $ 5,500,000 | $ 28,800,000 | $ 34,300,000 |  |  |  |  |  |  |  |  |  |  |

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