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Partners' Capital And Distributions (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 9 Months Ended |  |  |  |  |  |  |
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Sep. 26, 2014 | Sep. 30, 2014 | Sep. 26, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share |  |  | $ 50.71 |  |  |  |  |  |
Partners' Capital Account, Public Sale of Units Net of Offering Costs | $ 225.60 |  |  |  |  |  |  |  |
Common units, issued |  | 93,290,985 | 4,600,000 |  |  | 88,690,985 |  |  |
Common units, outstanding |  | 93,290,985 |  |  |  | 88,690,985 | 88,691,000 |  | 81,202,752
Conversion Feature, Minimum Distribution Coverage Ratio |  | 1.1 |  |  |  |  |  |  |
Distribution paid per common unit |  | $ 0.5650 |  | $ 0.5500 | $ 0.5350 | $ 0.5225 | $ 0.5100 | $ 0.4975 |
Waiver Units Class 1 [Member] |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |
Waiver units authorized |  | 1,738,000 |  |  |  |  |  |  |
Waiver Units Class 3 [Member] |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |
Waiver units authorized |  | 1,750,000 |  |  |  |  |  |  |
Waiver units issued |  | 1,738,000 |  |  |  |  |  |  |
Waiver Units Class 4 [Member] |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |
Waiver units authorized |  | 1,750,000 |  |  |  |  |  |  |
Waiver units issued |  | 1,738,000 |  |  |  |  |  |  |
Waiver units outstanding |  | 1,738,000 |  |  |  |  |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |
Common units, outstanding |  | 93,250,988 |  |  |  |  |  |  |
Class B [Member] |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |
Common units, outstanding |  | 39,997 |  |  |  |  |  |  |
Class Two [Member] |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |
Conversion Feature, Minimum Distribution Coverage Ratio |  | 1.1 |  |  |  |  |  |  |
Class Three [Member] |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |
Conversion Feature, Minimum Distribution Coverage Ratio |  | 1.1 |  |  |  |  |  |  |
Class Four [Member] |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |
Conversion Feature, Minimum Distribution Coverage Ratio |  | 1.1 |  |  |  |  |  |  |
Conversion feature threshold, quarterly distribution, minimum, per unit |  | 0.52 |  |  |  |  |  |  |
Waiver Units Class2 [Member] |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |
Waiver units authorized |  | 1,750,000 |  |  |  |  |  |  |
Waiver units issued |  | 1,738,000 |  |  |  |  |  |  |

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- Definition The number of limited partner units outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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