| Date | Acquired | Amount |
|---|---|---|
| Feb 06, 2012 |
|
Undisclosed amount |
| Nov 14, 2011 |
|
Undisclosed amount |
| Aug 04, 2011 |
|
Undisclosed amount |
| Sep 01, 2010 |
|
$ 80,000,000 |
| Oct 06, 2006 |
|
$ 115,000,000 |
