| Date | Acquired | Amount |
|---|---|---|
| Jun 29, 2011 |
|
$ 35,000,000 |
| Dec 01, 2010 |
|
Undisclosed amount |
| Oct 15, 2010 |
|
$ 55,000,000 |
| Mar 12, 2008 |
|
Undisclosed amount |
