Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue:      
Oil $ 321,047 $ 240,444 $ 203,876
Gas 21,444 16,289 19,376
Natural gas liquids 7,288 1,535 3,656
Total revenue 349,779 258,268 226,908
Operating expenses:      
Lease operating 103,276 79,922 59,516
Production and ad valorem taxes 40,402 35,716 31,379
Depletion, depreciation, amortization and asset retirement obligation accretion 116,344 78,414 57,664
Impairment of proved oil and gas properties 188,000    
General and administrative 35,625 24,032 20,914
Total operating expenses 483,647 218,084 169,473
Income (loss) from operations (133,868) 40,184 57,435
Other income (expense):      
Interest expense, net (29,302) (15,523) (3,844)
Commodity derivative instruments gain (loss) (15,336) 5,176 (5,321)
Other income 21 20 85
Total other expense (44,617) (10,327) (9,080)
Income (loss) before income taxes (178,485) 29,857 48,355
Income tax benefit (expense) 64,679 (11,881) (17,870)
Net income (loss) $ (113,806) $ 17,976 $ 30,485
Net income (loss) per common share:      
Basic $ (1.67) $ 0.30 $ 0.53
Diluted $ (1.67) $ 0.30 $ 0.47
Weighted average common shares outstanding:      
Basic 68,260 59,424 57,612
Diluted 68,260 59,452 65,029