| Date | Acquired | Amount |
|---|---|---|
| Mar 13, 2012 |
|
Undisclosed amount |
| Dec 23, 2009 |
|
Undisclosed amount |
| Jan 20, 2009 |
|
Undisclosed amount |
| Feb 28, 2008 |
|
Undisclosed amount |
| Jun 02, 2005 |
|
$ 20,000,000 |
| Mar 24, 2005 |
|
$ 7,500,000 |
| Mar 16, 2004 |
|
Undisclosed amount |
| Oct 30, 2002 |
|
Undisclosed amount |
