| Date | Acquired | Amount |
|---|---|---|
| May 12, 2011 |
|
Undisclosed amount |
| Dec 01, 2009 |
|
Undisclosed amount |
| Jul 31, 2008 |
|
$ 23,000,000 |
| Jan 21, 2003 |
|
$ 60,000,000 |
