| Date | Acquired | Amount |
|---|---|---|
| May 22, 2014 |
|
Undisclosed amount |
| Sep 17, 2013 |
|
$ 92,000,000 |
| Feb 11, 2013 |
|
Undisclosed amount |
| Feb 20, 2012 |
|
$ 135,000,000 |
| Aug 15, 2011 |
|
Undisclosed amount |
| Aug 06, 2007 |
|
$ 210,000,000 |
| Sep 06, 2005 |
|
$ 43,000,000 |
| Jun 02, 2004 |
|
$ 29,000,000 |
