| Date | Acquired | Amount |
|---|---|---|
| Oct 23, 2013 |
|
$ 310,000,000 |
| Jul 26, 2010 |
|
$ 475,000,000 |
| Mar 02, 2010 |
|
Undisclosed amount |
| Feb 06, 2001 |
|
$ 27,000,000 |
| Mar 09, 2000 |
|
Undisclosed amount |
