| Date | Acquired | Amount |
|---|---|---|
| Feb 22, 2017 |
|
$ 310,000,000 |
| Sep 16, 2014 |
|
Undisclosed amount |
| Jun 11, 2014 |
|
$ 150,000,000 |
| Jun 10, 2014 |
|
$ 235,000,000 |
| Sep 05, 2013 |
|
Undisclosed amount |
| May 08, 2012 |
|
Undisclosed amount |
| Jan 13, 2010 |
|
$ 20,000,000 |
