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Long-Term Debt (Details 8) (USD $) | Dec. 31, 2013 | Dec. 31, 2013 4.25% convertible senior notes due June 2014 | Dec. 31, 2012 4.25% convertible senior notes due June 2014 | Jun. 30, 2009 4.25% convertible senior notes due June 2014 | Dec. 31, 2013 Partnership's 6% notes due 2021 | Mar. 31, 2013 Partnership's 6% notes due 2021
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Long-Term Debt Maturity Schedule |  |  |  |  |  |
2014 | $ 355,000,000 |  |  |  |  |
2015 | 427,000 |  |  |  |  |
2016 | 49,234,000 |  |  |  |  |
2017 | 234,000 |  |  |  |  |
2018 | 763,234,000 |  |  |  |  |
Thereafter | 350,410,000 |  |  |  |  |
Total Long-Term Debt | 1,518,539,000 |  |  |  |  |
Long-Term Debt |  |  |  |  |  |
Interest rate (as a percent) |  | 4.25% | 4.25% | 4.25% | 6.00% |
Amount of unamortized discount of notes |  | $ 11,300,000 | $ 34,300,000 | $ 97,900,000 | $ 5,000,000 | $ 5,500,000

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