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Partners' Capital And Distributions (Narrative) (Details) (USD $) | 3 Months Ended |  | 12 Months Ended | 3 Months Ended |  | 3 Months Ended |  |  |  | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Waiver Units Class 1 [Member] | Mar. 31, 2013 Waiver Units Class 3 [Member] | Mar. 31, 2013 Waiver Units Class 4 [Member] | Dec. 31, 2012 Class A [Member] | Dec. 31, 2012 Class B [Member] | Mar. 31, 2013 Waiver Units [Member] | May 15, 2013 Waiver Units [Member] | Aug. 14, 2012 Waiver Units [Member] | Feb. 14, 2012 Waiver Units [Member] | Dec. 31, 2012 Class One [Member] | Mar. 31, 2013 Class Two [Member] | Dec. 31, 2012 Class Two [Member] | Mar. 31, 2013 Class Three [Member] | Dec. 31, 2012 Class Three [Member] | Mar. 31, 2013 Class Four [Member] | Dec. 31, 2012 Class Four [Member] | Mar. 31, 2013 Waiver Units Class2 [Member]
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units, issued |  | 81,202,752 | 81,202,752 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common units |  | 0 |  |  |  | 5,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units, outstanding |  | 81,202,752 | 81,202,752 |  |  | 79,465,000 | 71,965,000 |  |  |  | 81,162,755 | 39,997 |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  |  |  |  |  | 1,738,000 | 1,750,000 | 1,750,000 |  |  | 3,476,466 |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.43 |  | 0.46 |  | 0.49 |  | 0.52 |
Waiver Units Class 1 Convertible Date |  |  |  |  |  | February 14, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution paid per common unit |  | $ 0.4975 | $ 0.4850 | $ 0.4725 | $ 0.4600 | $ 0.4500 |  |  |  |  |  |  |  | $ 0.50 | $ 0.46 | $ 0.44 |  |  |  |  |  |  |  |
Waiver Units Class 3 Convertible Date | May 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Waiver units outstanding |  |  |  |  |  |  |  |  | 5,214,099 | 5,214,099 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Waiver Units Class 2 Convertible Date |  |  |  | August 14, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Member or Limited Partner, Distribution Date |  | May 15, 2013 | Feb. 14, 2013 | Nov. 14, 2012 | Aug. 14, 2012 | May 15, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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