Units Outstanding

3 Months Ended

Mar. 31, 2013

Units Outstanding [Abstract]

Units Outstanding

6.      Units Outstanding

Changes in Holding Units outstanding during the three-month period ended March 31, 2013 were as follows:

Outstanding as of December 31, 2012	105,173,342
Options exercised	392,528
Units issued	—
Units forfeited	—
Outstanding as of March 31, 2013	105,565,870