| Date | Acquired | Amount |
|---|---|---|
| Jan 27, 2016 |
|
Undisclosed amount |
| Aug 04, 2015 |
|
Undisclosed amount |
| Oct 28, 2013 |
|
Undisclosed amount |
| Jul 23, 2013 |
|
$ 96,000,000 |
| Jan 07, 2013 |
|
$ 350,000,000 |
| Sep 19, 2012 |
|
Undisclosed amount |
| Jan 01, 2011 |
|
$ 90,000,000 |
| Jul 01, 2010 |
|
Undisclosed amount |
| Apr 30, 2010 |
|
$ 105,000,000 |
