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Partners' Capital And Distributions (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  |  |  |  | 3 Months Ended | 0 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Dec. 31, 2010 | Mar. 31, 2012 Waiver Units Class 1 [Member] | Mar. 31, 2012 Waiver Units Class 2 [Member] | Mar. 31, 2012 Waiver Units Class 3 [Member] | Mar. 31, 2012 Waiver Units Class 4 [Member] | Mar. 28, 2012 Class A [Member] | Mar. 31, 2012 Class A [Member] | Mar. 31, 2012 Class B [Member] | Mar. 31, 2012 Waiver Units [Member] | Mar. 31, 2012 Class One [Member] | Mar. 31, 2012 Class Two [Member] | Mar. 31, 2012 Class Three [Member] | Mar. 31, 2012 Class Four [Member]
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common units | 5,750,000 |  |  |  |  |  |  |  |  |  | 5,750,000 |  |  |  |  |  |  |
Price per share of common units issued |  |  |  |  |  |  |  |  |  |  | $ 30.80 |  |  |  |  |  |  |
Proceeds received from offering, net of costs |  |  |  |  |  |  |  |  |  |  | $ 169.5 |  |  |  |  |  |  |
Common units, outstanding | 79,465,000 | 64,615,000 | 71,965,000 |  |  | 64,615,000 |  |  |  |  |  | 79,424,522 | 39,997 |  |  |  |  |
Waiver units authorized |  |  |  |  |  |  | 1,750,000 | 1,750,000 | 1,750,000 | 1,750,000 |  |  |  |  |  |  |  |
Waiver units issued |  |  |  |  |  |  | 1,738,000 | 1,738,000 | 1,738,000 | 1,738,000 |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 | 1.1 | 1.1 | 1.1
Conversion feature threshold, quarterly distribution, minimum, per unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.43 | $ 0.46 | $ 0.49 | $ 0.52
Distribution paid per common unit | $ 0.4500 | $ 0.4075 | $ 0.4400 | $ 0.4275 | $ 0.4150 | $ 0.4000 |  |  |  |  |  |  |  | $ 0.44 |  |  |  |
Waiver units outstanding |  |  |  |  |  |  |  | 5,214,099 | 5,214,099 | 5,214,099 |  |  |  |  |  |  |  |

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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 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Monetary value of the issuance of new units of limited partnership interest in a public offering, net of offering costs. This is a parenthetical disclosure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 + Details
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