| Date | Acquired | Amount |
|---|---|---|
| Feb 04, 2015 |
|
Undisclosed amount |
| Apr 23, 2014 |
|
Undisclosed amount |
| Dec 04, 2013 |
|
$ 474,000,000 |
| Aug 05, 2013 |
|
$ 240,000,000 |
| Dec 12, 2012 |
|
Undisclosed amount |
| Dec 22, 2009 |
|
Undisclosed amount |
| Aug 05, 2008 |
|
Undisclosed amount |
