| Date | Acquired | Amount |
|---|---|---|
| Dec 17, 2004 |
|
$ 115,000,000 |
| Oct 16, 2003 |
|
$ 70,000,000 |
| Nov 19, 2001 |
|
Undisclosed amount |
| Aug 07, 2000 |
|
$ 607,500,000 |
| May 16, 2000 |
|
Undisclosed amount |
