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Partners' Capital And Distributions (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  | 9 Months Ended |  | 3 Months Ended |  | 9 Months Ended
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Sep. 16, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 Waiver Units Class 1 [Member] | Sep. 30, 2013 Waiver Units Class 3 [Member] | Sep. 30, 2013 Waiver Units Class 4 [Member] | Sep. 30, 2013 Class A [Member] | Sep. 30, 2013 Class B [Member] | Sep. 30, 2013 Waiver Units [Member] | May 15, 2013 Waiver Units [Member] | Sep. 30, 2013 Class Two [Member] | Sep. 30, 2013 Class Three [Member] | Sep. 30, 2013 Class Four [Member] | Sep. 30, 2013 Waiver Units Class2 [Member]
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units, issued | 5,750,000 | 88,690,985 | 88,690,985 |  |  |  | 81,202,752 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share | $ 47.51 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Public Sale of Units Net of Offering Costs | $ 263.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common units |  |  | 5,750,000 | 5,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units, outstanding |  | 88,690,985 | 88,690,985 | 81,203,000 |  |  | 81,202,752 |  |  | 71,965,000 |  |  |  | 88,650,988 | 39,997 |  |  |  |  |  |
Waiver units authorized |  |  |  |  |  |  |  |  |  |  | 1,738,000 | 1,750,000 | 1,750,000 |  |  | 1,738,233 |  |  |  |  | 1,750,000
Conversion Feature, Minimum Distribution Coverage Ratio |  |  | 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 | 1.1 | 1.1 |
Waiver units issued |  |  |  |  |  |  |  |  |  |  |  | 1,738,000 | 1,738,000 |  |  |  |  |  |  |  | 1,738,000
Conversion feature threshold, quarterly distribution, minimum, per unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.49 | 0.52 |
Distribution paid per common unit |  | $ 0.5225 | $ 0.5225 | $ 0.4725 | $ 0.5100 | $ 0.4975 | $ 0.4850 | $ 0.4600 | $ 0.4500 |  |  |  |  |  |  |  | $ 0.4975 |  |  |  |
Waiver Units Class 3 Convertible Date |  | May 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Waiver units outstanding |  |  |  |  |  |  |  |  |  |  |  |  | 1,738,000 |  |  |  |  |  |  |  |

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