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Condensed Consolidated Statement of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenues        
Oil and gas revenues $ 241,842 $ 145,203 $ 483,493 $ 283,109
Well services and midstream revenues 12,740 3,861 19,393 4,521
Total revenues 254,582 149,064 502,886 287,630
Expenses        
Lease operating expenses 18,266 12,029 37,755 21,845
Well services and midstream operating expenses 6,644 1,207 9,558 1,684
Marketing, transportation and gathering expenses 10,779 1,970 14,168 4,539
Production taxes 21,397 13,720 43,486 26,986
Depreciation, depletion and amortization 66,790 44,213 133,051 83,099
Exploration expenses 392 0 2,249 2,835
Impairment of oil and gas properties 208 2,203 706 2,571
General and administrative expenses 16,656 13,537 30,510 25,736
Total expenses 141,132 88,879 271,483 169,295
Operating income (loss) 113,450 60,185 231,403 118,335
Other income (expense)        
Net gain (loss) on derivative instruments 12,591 74,595 (2,021) 56,009
Interest expense, net of capitalized interest (21,392) (14,074) (42,575) (27,973)
Other income 294 776 1,074 1,374
Total other income (expense) (8,507) 61,297 (43,522) 29,410
Income before income taxes 104,943 121,482 187,881 147,745
Income tax expense 37,824 45,439 68,911 55,261
Net income $ 67,119 $ 76,043 $ 118,970 $ 92,484
Earnings per share:        
Basic (Note 11) (in dollars per share) $ 0.73 $ 0.82 $ 1.29 $ 1.00
Diluted (Note 11) (in dollars per share) $ 0.72 $ 0.82 $ 1.28 $ 1.00
Weighted average shares outstanding:        
Basic (Note 11) (in shares) 92,399 92,176 92,387 92,153
Diluted (Note 11) (in shares) 92,702 92,222 92,812 92,339