| Date | Acquired | Amount |
|---|---|---|
| Jan 24, 2017 |
|
Undisclosed amount |
| Feb 25, 2016 |
|
Undisclosed amount |
| Aug 10, 2015 |
|
$ 160,000,000 |
| Feb 13, 2015 |
|
$ 60,000,000 |
| Dec 20, 2013 |
|
Undisclosed amount |
| Oct 24, 2011 |
|
Undisclosed amount |
| Feb 02, 2011 |
|
Undisclosed amount |
