| Date | Acquired | Amount |
|---|---|---|
| Jul 22, 2015 |
|
$ 3,400,000 |
| Apr 20, 2015 |
|
Undisclosed amount |
| May 30, 2014 |
|
$ 455,000,000 |
| Oct 14, 2013 |
|
$ 123,500,000 |
| Aug 13, 2013 |
|
$ 170,000,000 |
| Oct 18, 2010 |
|
Undisclosed amount |
| May 19, 2010 |
|
Undisclosed amount |
| Dec 22, 2008 |
|
Undisclosed amount |
| Nov 28, 2005 |
|
Undisclosed amount |
| Feb 15, 2005 |
|
$ 74,000,000 |
| Jan 13, 2005 |
|
Undisclosed amount |
| Jan 31, 1998 |
|
Undisclosed amount |
| Oct 24, 1996 |
|
Undisclosed amount |
| Sep 23, 1996 |
|
Undisclosed amount |
| Jun 29, 1994 |
|
Undisclosed amount |
