| Date | Acquired | Amount |
|---|---|---|
| Aug 27, 2017 |
|
Undisclosed amount |
| Mar 26, 2013 |
|
Undisclosed amount |
| May 15, 2008 |
|
$ 1,800,000 |
| Apr 24, 2008 |
|
$ 110,000,000 |
| Mar 20, 2007 |
|
Undisclosed amount |
| Nov 04, 2005 |
|
$ 325,000,000 |
