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Acquisition (Narrative) (Details) $ in Thousands |  |  |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 24, 2015 USD ($) platform mi | Jul. 23, 2015 USD ($) | Jul. 22, 2015 USD ($) shares | Apr. 10, 2015 USD ($) shares | Nov. 13, 2014 USD ($) bbl | Sep. 30, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common units, issued | shares |  |  | 10,350,000 | 4,600,000 |  | 109,979,218 | 95,029,218
Partners' Capital Account, Public Sale of Units Net of Offering Costs |  |  | $ 437,000 | $ 198,000 |  |  |
AROs arising from the Enterprise acquisition |  |  |  |  |  | $ 158,133 |
Asset Retirement Obligation |  |  |  |  |  | 177,308 | $ 14,790
Long-term Debt, Fair Value |  |  |  |  |  | 1,717,380 | $ 1,003,600
Enterprise Offshore Acquisition |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | $ 13,000 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 19 years |  |  |  |  |  |
Effective date of acquisition | Jul. 24, 2015 |  |  |  |  |  |
Business Acquisition, Transaction Costs | $ 1,500,000 |  |  |  |  |  |
Pipeline Length | mi | 2,350 |  |  |  |  |  |
Number of Hubs | platform | 6 |  |  |  |  |  |
American Phoenix Acquisition [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 30 years |  |
Effective date of acquisition |  |  |  |  | Nov. 13, 2014 |  |
Business Acquisition, Transaction Costs |  |  |  |  | $ 157,000 |  |
Business Acquisition, Cargo Capacity | bbl |  |  |  |  | 330,000 |  |
Cameron Highway Oil Pipeline Company [Member] | Enterprise Offshore Acquisition |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage | 50.00% |  |  |  |  |  |
Poseidon Oil Pipeline Company [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 64.00% |
Poseidon Oil Pipeline Company [Member] | Enterprise Offshore Acquisition |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage | 36.00% |  |  |  |  |  |
Sekco [Member] | Enterprise Offshore Acquisition |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage | 50.00% |  |  |  |  |  |
Independence Hub, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  | 20.00% |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 80.00% |
Six Point Seven Five Percentage Senior Unsecured Notes [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 750,000 |  |  |  | $ 750,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.75% |
Proceeds from Debt, Net of Issuance Costs |  | $ 728,600 |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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