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Long-Term Debt (Details 2) (USD $) | 3 Months Ended | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended | 1 Months Ended |
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Mar. 31, 2013 | Mar. 31, 2012 | Jan. 31, 2013 4.75% convertible senior notes due January 2014 | Mar. 31, 2013 4.75% convertible senior notes due January 2014 | Dec. 31, 2012 4.75% convertible senior notes due January 2014 | Mar. 31, 2013 Partnership's senior notes due 2021 | Mar. 31, 2013 Partnership's senior notes due 2021 | Mar. 31, 2013 Partnership's senior notes due 2021 Prior to April 1, 2016 item | Mar. 31, 2013 Partnership's senior notes due 2021 Twelve month period beginning April 1, 2017 | Mar. 31, 2013 Partnership's senior notes due 2021 Twelve month period beginning April 1, 2018 | Mar. 31, 2013 Partnership's senior notes due 2021 Beginning April 1, 2019 and thereafter | Mar. 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 | Mar. 31, 2012 Revolving credit facility due July 2016 | Mar. 31, 2012 Revolving credit facility due July 2016 | Mar. 31, 2013 Revolving credit facility due July 2016 | Mar. 31, 2013 Partnership's revolving credit facility and term loan facility | Mar. 31, 2013 Partnership's revolving credit facility and term loan facility | Mar. 31, 2012 Partnership's revolving credit facility and term loan facility | Mar. 31, 2013 Partnership's revolving credit facility | Mar. 31, 2012 Partnership's revolving credit facility | Mar. 31, 2013 Partnership's term loan facility
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long term debt | $ 1,145,251,000 | $ 913,048,000 | $ 143,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.75% |  | 4.75% | 6.00% | 6.00% |  |  |  |  | 4.25% | 4.25% |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount |  |  | 100.00% |  |  |  |  | 106.00% | 103.00% | 101.50% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (200,000,000) |  |  |  |  |  | (100,000,000) | 200,000,000 |
Revolving credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000,000 | 900,000,000 |  |  |  |  | 650,000,000 | 750,000,000 |
Write-off of deferred financing costs |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 |  | 700,000 |  |  |  |  |
Decrease in applicable margin (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  | 0.50%
Outstanding borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 220,500,000 |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 173,800,000 |  |  |  |  |  |
Initial conversion rate of debt instrument (Shares per USD) |  |  |  |  |  |  |  |  |  |  |  | 0.0431951 |  |  |  |  |  |  |  |  |  |  |
Initial conversion price per common stock shares (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 23.15 |  |  |  |  |  |  |  |  |  |  |
Undrawn capacity under revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 505,700,000 |  |  |  | 412,000,000 |  |
Available borrowings under revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 505,700,000 |  |  |  | 412,000,000 |  |
Maximum total debt to EBITDA ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25 |  |  |  |  |
Maximum revised total debt to EBITDA ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.5 |  |  |  |  |
Revised total debt to EBITDA ratio, applicable period after acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |
Maximum senior secured debt to EBITDA ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  |  |  |
Principle amount of senior notes |  |  |  |  |  | 350,000,000 | 350,000,000 |  |  |  |  |  |  | 355,000,000 |  |  |  |  |  |  |  |  |
Amount by which value of shares converted exceeds principle |  |  |  |  |  |  |  |  |  |  |  | 59,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings of long-term debt | 1,204,037,000 | 844,500,000 |  |  |  | 336,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of unamortized discount of notes |  |  |  |  |  | 5,500,000 | 5,500,000 |  |  |  |  | 28,800,000 | 34,300,000 |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  | 6.25% | 6.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  | $ 7,600,000 |  |  |  |  |  |  |  |  |  |  |  | $ 4,300,000 | $ 500,000 |  |  |
Maximum period in which the entity is required to register the Notes |  |  |  |  |  | 365 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of the aggregate principal amount of debt instruments that may be redeemed prior to 2016 |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of equity offerings |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum notes remaining outstanding if notes redeemed prior to 2016 (as a percent) |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of days within which the entity may redeem a percentage of the note following the date of the closing of equity offering |  |  |  |  |  |  |  | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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