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Equity and Distributions, Distributions (Details) (USD $) | 6 Months Ended | 3 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 Cash Distribution [Member] | Mar. 31, 2013 Cash Distribution [Member]
Distributions to Partners [Abstract] |  |  |
Distribution Per Common Unit (in dollars per unit) |  | $ 0.68 | $ 0.67
Record Date |  | Jul. 31, 2013 | Apr. 30, 2013
Payment Date |  | Aug. 07, 2013 | Jul. 05, 2013
Number of Designated Units to be excluded from distributions during 2013 | 23,700,000 |  |
Number of Designated Units to be excluded from distributions during 2014 | 22,560,000 |  |
Number of Designated Units to be excluded from distributions during 2015 | 17,690,000 |  |

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- Definition Date of record for distribution of cash or unit to limited partner of limited partnership (LP), in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 3: 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 + Details
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