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Long-Term Debt (Details 4) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2013 Partnership's 6% senior notes due 2021 | Dec. 31, 2013 Partnership's 6% senior notes due 2021 | Jan. 31, 2014 Partnership's 6% senior notes due 2021 Subsequent events | Mar. 31, 2013 Partnership's 6% senior notes due 2021 Prior to April 1, 2016 offering | Mar. 31, 2013 Partnership's 6% senior notes due 2021 Twelve month period beginning April 1, 2017 | Mar. 31, 2013 Partnership's 6% senior notes due 2021 Twelve month period beginning April 1, 2018 | Mar. 31, 2013 Partnership's 6% senior notes due 2021 Beginning April 1, 2019 and thereafter
Long-Term Debt |  |  |  |  |  |  |  |  |  |
Principle amount of senior notes |  |  |  | $ 350,000,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 6.00% | 6.00% |  |  |  |
Proceeds from borrowings of long-term debt | 2,108,037,000 | 1,878,000,000 | 1,893,740,000 | 336,900,000 |  |  |  |  |  |
Transaction costs |  |  |  |  | 7,800,000 |  |  |  |  |
Amount of unamortized discount of notes |  |  |  | 5,500,000 | 5,000,000 |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  | 6.25% |  |  |  |  |
Interest expense related to amortization of debt discount |  |  |  |  | $ 400,000 |  |  |  |  |
Maximum percentage of the aggregate principal amount of debt instruments that may be redeemed |  |  |  |  |  |  | 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 |  |  |

X
- 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 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 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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