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Units Outstanding (Tables)
 6 Months Ended
Jun. 30, 2013
Units Outstanding [Abstract]  
Changes in units outstanding
Changes in units outstanding during the six-month period ended June 30, 2013 were as follows:

Outstanding as of December 31, 2012
  
277,600,901
 
Options exercised
  
778,739
 
Units issued
  
—
 
Units retired
  
(4,747
)
Units forfeited  
—
 
Outstanding as of  June 30, 2013
  
278,374,893