| Date | Acquired | Amount |
|---|---|---|
| Aug 08, 2012 |
|
Undisclosed amount |
| Dec 11, 2007 |
|
$ 336,000,000 |
| Dec 18, 2003 |
|
Undisclosed amount |
| Apr 01, 2003 |
|
Undisclosed amount |
| May 29, 1997 |
|
Undisclosed amount |
