| Date | Acquired | Amount |
|---|---|---|
| Nov 01, 2017 |
|
Undisclosed amount |
| Feb 11, 2016 |
|
$ 342,000,000 |
| Jul 31, 2014 |
|
Undisclosed amount |
| Aug 03, 2011 |
|
Undisclosed amount |
| Jun 17, 2010 |
|
$ 135,000,000 |
| Apr 29, 2009 |
|
Undisclosed amount |
