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Equity and Distributions, Summary of Changes in Outstanding Units (Details)
 6 Months Ended
Jun. 30, 2014
Common Units (Unrestricted) [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 932,074,401
Common units issued in connection with at-the-market program (in units) 795,167
Common units issued in connection with DRIP and EUPP (in units) 2,519,969
Common units issued in connection with the vesting and exercise of unit options (in units) 507,054
Common units issued in connection with the vesting of phantom unit awards (in units) 9,171
Common units issued in connection with the vesting of restricted common unit awards (in units) 1,276,762
Forfeiture of restricted common unit awards (in units) 0
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) (434,584)
Other (in units) 8,601
Ending Balance (in units) 936,756,541
Restricted Common Units [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 3,610,607
Common units issued in connection with at-the-market program (in units) 0
Common units issued in connection with DRIP and EUPP (in units) 0
Common units issued in connection with the vesting and exercise of unit options (in units) 0
Common units issued in connection with the vesting of phantom unit awards (in units) 0
Common units issued in connection with the vesting of restricted common unit awards (in units) (1,276,762)
Forfeiture of restricted common unit awards (in units) (115,250)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) 0
Other (in units) 0
Ending Balance (in units) 2,218,595
Common units [Member]
  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 935,685,008
Common units issued in connection with at-the-market program (in units) 795,167
Common units issued in connection with DRIP and EUPP (in units) 2,519,969
Common units issued in connection with the vesting and exercise of unit options (in units) 507,054
Common units issued in connection with the vesting of phantom unit awards (in units) 9,171
Common units issued in connection with the vesting of restricted common unit awards (in units) 0
Forfeiture of restricted common unit awards (in units) (115,250)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) (434,584)
Other (in units) 8,601
Ending Balance (in units) 938,975,136