| Date | Acquired | Amount |
|---|---|---|
| Dec 06, 2011 |
|
$ 110,000,000 |
| Apr 26, 2011 |
|
$ 290,000,000 |
| Mar 14, 2011 |
|
Undisclosed amount |
| Oct 17, 2010 |
|
Undisclosed amount |
| Jul 01, 2010 |
|
Undisclosed amount |
| May 03, 2010 |
|
$ 50,000,000 |
| Mar 07, 2000 |
|
Undisclosed amount |
