| Date | Acquired | Amount |
|---|---|---|
| Aug 31, 2017 |
|
$ 128,000,000 |
| Aug 07, 2014 |
|
$ 30,000,000 |
| Oct 31, 2013 |
|
Undisclosed amount |
| Aug 15, 2011 |
|
$ 28,000,000 |
| Dec 16, 2009 |
|
Undisclosed amount |
| Oct 02, 2008 |
|
Undisclosed amount |
