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Units Outstanding (Details)	9 Months Ended
Units Outstanding (Details)	Sep. 30, 2012
Limited Partners' Capital Account [Line Items]
Outstanding, Beginning of Period (in units)	277,847,588
Options exercised (in units)	0
Units issued (in units)	0
Units retired (in units)	(238,487)
Units forfeited (in units)	0
Outstanding, End of Period (in units)	277,609,101

The number of limited partner units outstanding.

Number of shares related to Restricted Stock Award forfeited during the period.

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.