Existing Senior Notes

Existing Senior Notes. (a) the $250,000,000 of 7-1/8% senior unsecured notes issued on June 1, 2007 and due on June 1, 2017, (b) the $225,000,000 of 8-7/8% senior unsecured notes issued on November 25, 2009 and due on January 15, 2020 and (c) the $250,000,000 of 77⁄8% senior unsecured notes issued on November 30, 2011 and due on March 1, 2022.