| Date | Acquired | Amount |
|---|---|---|
| Aug 14, 2017 |
|
Undisclosed amount |
| Nov 21, 2016 |
|
$ 145,000,000 |
| Sep 18, 2006 |
|
$ 810,000,000 |
| Jan 25, 2006 |
|
Undisclosed amount |
| Aug 15, 2003 |
|
$ 367,400,000 |
| Sep 02, 1999 |
|
Undisclosed amount |
| Feb 27, 1999 |
|
$ 500,000,000 |
| Oct 07, 1995 |
|
$ 58,000,000 |
