| Date | Acquired | Amount |
|---|---|---|
| Aug 07, 2015 |
|
Undisclosed amount |
| Mar 19, 2015 |
|
Undisclosed amount |
| Dec 02, 2014 |
|
Undisclosed amount |
| Jun 24, 2014 |
|
$ 350,000,000 |
| Feb 14, 2013 |
|
$ 155,000,000 |
| Feb 16, 2012 |
|
$ 18,000,000 |
| Sep 19, 2011 |
|
Undisclosed amount |
| Jan 20, 2010 |
|
Undisclosed amount |
