Earnings Conference Call Scheduled for Thursday, November 7, 2013 at 10:00 a.m. CT

Company Expects Production Increase of 26% to 32% in 2014

Conference Call Scheduled to Follow

Record Production Totaling 135,700 Boe per Day for Second Quarter 2013, an Increase of 12% Sequentially and 43% Compared to Second Quarter 2012

Earnings Conference Call Scheduled for Thursday, August 8, 2013 at 10:00 a.m. CT

Record Production Totaling 121,500 Boe per Day for First Quarter 2013, an Increase of 14% Sequentially and 42% Compared to First Quarter 2012

Earnings Conference Call Scheduled for Thursday, May 9, 2013 at 9 a.m. CT

Record Fourth Quarter EBITDAX of $594.5 Million Is 44 Percent Higher Than Final Quarter of 2011

Earnings Conference Call Scheduled for Thursday, February 28, 2013 at 9 a.m. CT

Company's Bakken Proved Reserves Almost Double, Exceeding a Half-Billion Barrels of Oil Equivalent

Company Expects Lower 2013 Production Operating Costs per Boe and Increased Production

Earnings Conference Call Scheduled for Thursday, November 8, 2012 at 9 a.m. CT