| Date | Acquired | Amount |
|---|---|---|
| Apr 19, 2017 |
|
Undisclosed amount |
| Jul 28, 2016 |
|
$ 57,000,000 |
| Jan 20, 2016 |
|
Undisclosed amount |
| Sep 01, 2012 |
|
$ 1,000,000,000 |
| Dec 28, 2011 |
|
$ 10,000,000 |
| Jul 20, 2011 |
|
$ 110,000,000 |
| Jul 19, 2011 |
|
Undisclosed amount |
| Oct 21, 2010 |
|
Undisclosed amount |
| Jan 20, 2009 |
|
$ 25,000,000 |
