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Units Outstanding
9 Months Ended
Sep. 30, 2012
Units Outstanding [Abstract]  
Units Outstanding
5.      Units Outstanding
 
Changes in Holding Units outstanding during the nine-month period ended September 30, 2012 were as follows:

Outstanding as of December 31, 2011
  105,173,342 
Options exercised
   
Units issued
   
Units forfeited
   
Outstanding as of September 30, 2012
  105,173,342