| Date | Acquired | Amount |
|---|---|---|
| Aug 27, 2013 |
|
Undisclosed amount |
| Aug 10, 2012 |
|
$ 260,000,000 |
| Dec 03, 2009 |
|
Undisclosed amount |
| Jul 05, 2009 |
|
$ 157,100,000 |
