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Subsequent Events (Details) (USD $) | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Apr. 02, 2014 Subsequent events Partnership | Apr. 10, 2014 Subsequent events Partnership MidCon | Apr. 07, 2014 Subsequent events Partnership Partnership 2014 Notes
Subsequent events |  |  |  |  |
Sale of common units (in shares) |  |  | 6,210,000 |  |
Common units to cover over-allotments (in shares) |  |  | 810,000 |  |
Net proceeds from the sale of Partnership units |  |  | $ 169,500,000 |  |
Proceeds from issuance of general partner units |  |  | 3,600,000 |  |
General partner units issued (in shares) |  |  | 126,000 |  |
Approximate general partner interest in limited partnership (as a percent) |  |  | 2.00% |  |
Principle amount of senior notes |  |  |  |  | 350,000,000
Interest rate (as a percent) |  |  |  |  | 6.00%
Net proceeds from borrowings of long-term debt | 332,500,000 | 1,204,037,000 |  |  | 337,400,000
Amount of original issuance discount on notes |  |  |  |  | 5,700,000
Effective interest rate (as a percent) |  |  |  |  | 6.25%
Transaction costs |  |  |  |  | 6,900,000
Maximum period for registration of notes pursuant to registration rights agreement after April 7, 2014 |  |  |  |  | 365 days
Total cash consideration |  |  |  | 362,800,000 |
Assets acquired by parent company |  |  |  | $ 9,400,000 |

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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, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of general partner units issued during the period. + 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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