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Partners' Capital and Distributions (Details 2) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Partners' Capital and Distributions
Cash distributions per common unit (in dollars per unit)	$ 0.5425	$ 0.5325	$ 0.5225	$ 0.5125	$ 0.4975	$ 0.4913	$ 0.4850	$ 0.4788	$ 0.4750	$ 0.4713	$ 0.4675	$ 0.4638	$ 2.1100	$ 1.9525	$ 1.88
Cash distributions per common unit excess over MQD (in dollars per unit)	$ 0.3175	$ 0.3075	$ 0.2975	$ 0.2875	$ 0.2725	$ 0.2663	$ 0.2600	$ 0.2538	$ 0.2500	$ 0.2463	$ 0.2425	$ 0.2388

X

- Definition

The per-unit cash dividend declared or paid to a common shareholder or a unit-holder by a LLC or LP in excess of the minimum distribution level.

+ References

No definition available.

+ Details

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- Definition

Cash dividends declared or paid to each outstanding limited partnership unit during the reporting period.

+ References

Reference 1: 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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section F

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