| Date | Acquired | Amount |
|---|---|---|
| Sep 26, 2017 |
|
Undisclosed amount |
| Apr 10, 2017 |
|
Undisclosed amount |
| Apr 01, 2016 |
|
Undisclosed amount |
| Dec 03, 2015 |
|
Undisclosed amount |
| Sep 01, 2015 |
|
$ 6,800,000 |
| Apr 29, 2015 |
|
Undisclosed amount |
| Sep 01, 2014 |
|
Undisclosed amount |
| May 22, 2014 |
|
$ 300,000,000 |
| Feb 09, 2012 |
|
Undisclosed amount |
| Dec 22, 2010 |
|
Undisclosed amount |
