| Date | Acquired | Amount |
|---|---|---|
| Mar 27, 2017 |
|
Undisclosed amount |
| Dec 02, 2016 |
|
Undisclosed amount |
| Aug 31, 2016 |
|
Undisclosed amount |
| Aug 22, 2013 |
|
Undisclosed amount |
| Jun 14, 2013 |
|
Undisclosed amount |
| Jun 03, 2013 |
|
Undisclosed amount |
| Apr 25, 2013 |
|
Undisclosed amount |
| Apr 16, 2012 |
|
Undisclosed amount |
| May 31, 2011 |
|
Undisclosed amount |
| May 23, 2011 |
|
Undisclosed amount |
| Oct 18, 2010 |
|
Undisclosed amount |
| Jul 01, 2009 |
|
$ 600,000,000 |
| Sep 23, 2008 |
|
Undisclosed amount |
| Dec 01, 2007 |
|
Undisclosed amount |
| Apr 05, 2007 |
|
$ 546,000,000 |
| Mar 01, 2007 |
|
Undisclosed amount |
| Nov 01, 2000 |
|
$ 360,000,000 |
