| Date | Acquired | Amount |
|---|---|---|
| Aug 27, 2008 |
|
Undisclosed amount |
| Jul 12, 2006 |
|
Undisclosed amount |
| Aug 19, 2005 |
|
$ 295,000,000 |
| Jul 29, 2003 |
|
$ 19,900,000 |
