| Date | Acquired | Amount |
|---|---|---|
| Jul 16, 2017 |
|
Undisclosed amount |
| Jan 06, 2016 |
|
$ 70,000,000 |
| Jan 22, 2015 |
|
$ 780,000,000 |
| Jan 20, 2015 |
|
$ 200,000,000 |
| Jun 18, 2014 |
|
Undisclosed amount |
| May 21, 2014 |
|
$ 365,000,000 |
| Apr 10, 2013 |
|
Undisclosed amount |
| Dec 19, 2012 |
|
Undisclosed amount |
| Feb 18, 2011 |
|
Undisclosed amount |
| Sep 15, 2010 |
|
Undisclosed amount |
| Sep 15, 2010 |
|
Undisclosed amount |
| Aug 23, 2005 |
|
Undisclosed amount |
