| Date | Acquired | Amount |
|---|---|---|
| Sep 18, 2017 |
|
$ 830,000,000 |
| May 08, 2017 |
|
$ 100,000,000 |
| Aug 26, 2015 |
|
Undisclosed amount |
| Feb 15, 2012 |
|
$ 100,000,000 |
| Dec 10, 2010 |
|
Undisclosed amount |
| Feb 28, 2007 |
|
Undisclosed amount |
| Nov 21, 2006 |
|
Undisclosed amount |
| Apr 11, 2006 |
|
Undisclosed amount |
| Mar 24, 2006 |
|
Undisclosed amount |
| Jul 21, 2003 |
|
Undisclosed amount |
| Jan 21, 2003 |
|
$ 71,200,000 |
| Oct 03, 2002 |
|
$ 14,000,000 |
| Sep 11, 2002 |
|
$ 6,200,000 |
| Feb 19, 2002 |
|
$ 42,000,000 |
