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Long-Term Debt (Details 2) (USD $) | 9 Months Ended | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 9 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended | 1 Months Ended |  |
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Sep. 30, 2013 | Sep. 30, 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 | Sep. 30, 2013 Partnership's senior notes due 2021 | Mar. 31, 2013 Partnership's senior notes due 2021 Prior to April 1, 2016 offering | 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 | Sep. 30, 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 | Sep. 30, 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, 2012 Partnership's revolving credit facility | Sep. 30, 2013 Partnership's revolving credit facility | Mar. 31, 2013 Partnership's revolving credit facility | Mar. 31, 2013 Partnership's term loan facility
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long term debt | $ 1,796,250,000 | $ 1,630,621,000 | $ 143,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.75% |  | 4.75% |  |  | 6.00% |  |  |  |  | 4.25% | 4.25% |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount of debt redeemed |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (200,000,000) |  |  |  |  |  | 200,000,000 |  |  |
Revolving credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000,000 | 900,000,000 |  |  |  |  | 750,000,000 |  | 650,000,000 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 156,500,000 |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,700,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 629,800,000 |  |  |  |  | 425,000,000 |  |
Available borrowings under revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 629,800,000 |  |  |  |  | 425,000,000 |  |
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 principal |  |  |  |  |  |  |  |  |  |  |  |  | 67,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings of long-term debt | 1,778,037,000 | 1,548,000,000 |  |  |  | 336,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of unamortized discount of notes |  |  |  |  |  | 5,500,000 | 5,500,000 | 5,200,000 |  |  |  |  | 17,300,000 | 34,300,000 |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount |  |  |  |  |  |  |  |  | 106.00% | 103.00% | 101.50% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
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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- Definition Represents the applicable period of the revised maximum ratio of total debt to EBITDA after the closure of acquisition under the partnership credit agreement. + References No definition available. + Details
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- Definition Represents the maximum ratio of senior secured debt to adjusted EBITDA. + References No definition available. + Details
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- Definition Represents the maximum ratio of total debt to EBITDA under the partnership credit agreement. + References No definition available. + Details
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- Definition Represents the maximum period of time within which the entity may redeem a percentage of the note with net proceeds of public or private equity offering following the date of the closing of such equity offering. + References No definition available. + Details
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- Definition The reduction of the percentage in the applicable margin used to compute the variable rate of the debt instrument. + References No definition available. + Details
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- Definition The maximum period following specified date in which the entity is required to register the debt instrument pursuant to the registration rights agreement. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets) and considering any amounts currently outstanding. + References No definition available. + Details
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- Definition Represents the minimum notes to remain outstanding expressed as a percentage of the principle amount if notes are redeemed before a specified date. + References No definition available. + Details
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- Definition Represents the maximum percentage of the aggregate principal amount of debt instruments that may be redeemed with net proceeds of equity offerings prior to specified date. + References No definition available. + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 5: 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(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Conversion Rate -URI http://asc.fasb.org/extlink&oid=6509012 + Details
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- Definition The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 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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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 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 FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Percentage of principal amount of debt redeemed. + References No definition available. + Details
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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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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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