| Sep 25, 2017 |
|
Undisclosed amount |
| Apr 19, 2017 |
|
Undisclosed amount |
| Jun 21, 2016 |
|
Undisclosed amount |
| Mar 09, 2016 |
|
Undisclosed amount |
| Feb 26, 2016 |
|
Undisclosed amount |
| Mar 11, 2013 |
|
$ 650,000,000 |
| Feb 28, 2012 |
|
Undisclosed amount |
| Feb 01, 2008 |
|
Undisclosed amount |
| May 21, 1998 |
|
$ 200,000,000 |