| Date | Acquired | Amount |
|---|---|---|
| May 04, 2015 |
|
$ 400,000,000 |
| Jan 22, 2008 |
|
$ 290,000,000 |
| Sep 18, 2007 |
|
Undisclosed amount |
| Feb 19, 2004 |
|
$ 486,700,000 |
| Feb 19, 2004 |
|
$ 150,000,000 |
| Aug 22, 2003 |
|
Undisclosed amount |
| Apr 14, 2003 |
|
Undisclosed amount |
| Jun 21, 2002 |
|
$ 1,200,000,000 |
| Mar 01, 1999 |
|
Undisclosed amount |
| Dec 01, 1997 |
|
Undisclosed amount |
