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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2014 USD ($) | Sep. 26, 2014 USD ($) $ / shares | Sep. 16, 2013 USD ($) $ / shares | Mar. 28, 2012 USD ($) $ / shares | Jan. 31, 2012 | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Jul. 22, 2013 USD ($) Tug_Boats Barges | Jan. 03, 2012 Pipelines
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Public Sale of Units Net of Offering Costs |  | $ 225,725 | $ 263,574 | $ 169,421 |  |  |  |  |  |
Price per share of common units issued | $ / shares |  | $ 50.71 | $ 47.51 | $ 30.80 |  |  |  |  |  |
Proceeds from issuance of senior unsecured notes, including premium |  |  |  |  |  | $ 350,000 | $ 350,000 | $ 101,000 |  |
Cash paid for acquisition |  |  |  |  |  | $ 157,000 | $ 230,880 | $ 205,576 |  |
Property, Plant and Equipment, Estimated Useful Lives |  |  |  |  |  | 25 |  |  |  |
American Phoenix Acquisition [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Effective date of acquisition | Nov. 13, 2014 |  |  |  |  |  |  |  |  |
Transaction costs related to business acquisition | $ 157,000 |  |  |  |  |  |  |  |  |
Hornbeck Acquisition [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of barges acquired | Barges |  |  |  |  |  |  |  |  | 9 |
Business Acquisition, Tug Boats Acquired | Tug_Boats |  |  |  |  |  |  |  |  | 9 |
Transaction costs related to business acquisition |  |  |  |  |  |  |  |  | $ 230,900 |
Gulf Of Mexico Crude Oil Pipeline Systems [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Effective date of acquisition |  |  |  |  | Jan. 03, 2012 |  |  |  |  |
Poseidon Oil Pipeline Company, L.L.C. [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 28.00% |  |  |  |
Marathon Offshore Pipeline, LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 100.00% |  |  |  |
Odyssey Pipeline L.L.C. [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 29.00% |  |  |  |
Eugene Island Pipeline System [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 23.00% |  |  |  |
Two Offshore Smaller Pipelines [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 100.00% |  |  |  |
Number of piepelines | Pipelines |  |  |  |  |  |  |  |  |  | 2
CHOPS [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 50.00% |  |  |  |

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