| Date | Acquired | Amount |
|---|---|---|
| Apr 13, 2015 |
|
$ 70,000,000 |
| Feb 14, 2012 |
|
Undisclosed amount |
| Apr 21, 2010 |
|
Undisclosed amount |
| Mar 13, 2010 |
|
Undisclosed amount |
| Jul 31, 2009 |
|
Undisclosed amount |
| Aug 02, 2006 |
|
$ 23,000,000 |
| Apr 13, 2006 |
|
$ 12,000,000 |
| Mar 02, 2006 |
|
Undisclosed amount |
| Aug 01, 2005 |
|
Undisclosed amount |
| Mar 21, 2005 |
|
$ 462,000,000 |
| Aug 13, 2004 |
|
$ 80,000,000 |
| Feb 03, 2004 |
|
Undisclosed amount |
| Sep 07, 2000 |
|
Undisclosed amount |
| Jun 30, 2000 |
|
Undisclosed amount |
| Jun 15, 1998 |
|
Undisclosed amount |
| Oct 26, 1994 |
|
$ 200,000,000 |
