Earnings Conference Call Scheduled for Thursday, November 3

Company Completes 45 Gross Bakken Wells in Third Quarter, Up From 34 in 2Q 2011

Schedule for Additional Presentations Announced

Company Raises North Dakota Bakken Well Model to 603,000 Boe

Earnings Conference Call Scheduled for Thursday, August 4 at 10 a.m. ET

$268.7 Million in EBITDAX Is 53 Percent Higher than 1Q10

Earnings Conference Call Scheduled for Thursday, May 5 at 10 a.m. ET

Proved Reserves Increased 42 Percent to 364.7 Million Barrels of Oil Equivalent

Earnings Conference Call Scheduled for Thursday, Feb. 24 at 10 a.m. ET

Third Quarter Daily Production Seven Percent Higher Than Second Quarter 2010

Third Quarter Conference Call Scheduled for Thursday, November 4, 2010 at 10 a.m. ET

$1.36 Billion Capital Expenditure Budget for 2011

Company Announces Additional Strong Well Completions in North Dakota and Montana

2Q 2010 Production Increases Nine Percent Over 1Q 2010 EBITDAX Grows 99 Percent to $211.6 Million $101.7 Million in Net Income, or $0.60 Per Share Significant Confirmation Well Announced in Anadarko Woodford Play

Second Quarter Conference Call Scheduled for Thursday, August 5, 2010 at 10 a.m. ET

2010 Production Growth Guidance Raised to a Range of 15-to-17 Percent