| Date | Acquired | Amount |
|---|---|---|
| Feb 09, 2011 |
|
Undisclosed amount |
| Jan 10, 2011 |
|
Undisclosed amount |
| Jun 01, 2010 |
|
$ 40,000,000 |
| Oct 27, 2009 |
|
$ 350,000,000 |
| Sep 01, 2009 |
|
Undisclosed amount |
| Jan 28, 2008 |
|
$ 157,000,000 |
