| Date | Acquired | Amount |
|---|---|---|
| May 01, 2017 |
|
Undisclosed amount |
| Aug 08, 2014 |
|
$ 890,000,000 |
| Dec 01, 2012 |
|
Undisclosed amount |
| Dec 20, 2011 |
|
Undisclosed amount |
| Jul 23, 2010 |
|
$ 40,000,000 |
| Feb 03, 2010 |
|
Undisclosed amount |
