| Date | Acquired | Amount |
|---|---|---|
| Oct 11, 2010 |
|
Undisclosed amount |
| Jul 01, 2008 |
|
Undisclosed amount |
| Apr 30, 2008 |
|
$ 124,400,000 |
| Jun 20, 2007 |
|
$ 185,000,000 |
| Jan 08, 2004 |
|
Undisclosed amount |
