| Date | Acquired | Amount |
|---|---|---|
| Oct 03, 2017 |
|
$ 28,000,000 |
| Jun 26, 2017 |
|
Undisclosed amount |
| Jun 19, 2017 |
|
$ 39,500,000 |
| Nov 09, 2016 |
|
$ 590,000,000 |
| Feb 08, 2016 |
|
Undisclosed amount |
| Sep 14, 2015 |
|
$ 175,000,000 |
| Oct 01, 2014 |
|
$ 40,000,000 |
| May 01, 2012 |
|
Undisclosed amount |
| May 23, 2011 |
|
Undisclosed amount |
| Dec 16, 2009 |
|
Undisclosed amount |
