| Date | Acquired | Amount |
|---|---|---|
| May 03, 2011 |
|
Undisclosed amount |
| Apr 27, 2011 |
|
Undisclosed amount |
| Dec 16, 2009 |
|
Undisclosed amount |
| Oct 24, 2008 |
|
Undisclosed amount |
| Oct 23, 2008 |
|
Undisclosed amount |
| Jun 01, 2007 |
|
$ 42,000,000 |
| May 01, 2007 |
|
Undisclosed amount |
| Apr 26, 2007 |
|
$ 202,000,000 |
| Feb 01, 2006 |
|
Undisclosed amount |
