| Date | Acquired | Amount |
|---|---|---|
| Mar 02, 2010 |
|
Undisclosed amount |
| Sep 06, 2006 |
|
$ 425,000,000 |
| Aug 09, 2005 |
|
Undisclosed amount |
| Apr 22, 2004 |
|
Undisclosed amount |
| Apr 05, 2004 |
|
Undisclosed amount |
| Dec 23, 2002 |
|
$ 38,000,000 |
