Units Outstanding (Tables)

6 Months Ended

Jun. 30, 2013

Units Outstanding [Abstract]

Changes in Holding Units Outstanding

Changes in Holding Units outstanding during the six-month period ended June 30, 2013 were as follows:

Outstanding as of December 31, 2012	105,173,342
Options exercised	778,739
Units issued	—
Units forfeited	—
Outstanding as of June 30, 2013	105,952,081