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Partners' Capital And Distributions (Narrative) (Details) (USD $) | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Partners Capital And Distributions [Line Items] |  |  |  |  |  |
Common units, issued | 88,690,985 |  | 88,690,985 |  |  |
Common units, outstanding | 88,690,985 |  | 88,690,985 |  | 82,941,000 | 81,203,000
Conversion Feature, Minimum Distribution Coverage Ratio | 1.1 |  |  |  |  |
Distribution paid per common unit | $ 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 | 88,650,988 |  |  |  |  |
Class B [Member] |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |
Common units, outstanding | 39,997 |  |  |  |  |
Waiver Units [Member] |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |
Waiver units authorized | 1,738,233 |  |  |  |  |
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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