| Date | Acquired | Amount |
|---|---|---|
| Jan 10, 2017 |
|
$ 150,000,000 |
| Apr 28, 2015 |
|
$ 350,000,000 |
| Jan 08, 2015 |
|
$ 125,000,000 |
| Apr 29, 2014 |
|
Undisclosed amount |
| Nov 01, 2011 |
|
Undisclosed amount |
| Dec 04, 2007 |
|
$ 55,000,000 |
| Jan 01, 2007 |
|
Undisclosed amount |
| Mar 08, 2006 |
|
$ 8,000,000 |
| Oct 01, 2001 |
|
Undisclosed amount |
| Mar 29, 2001 |
|
Undisclosed amount |
