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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenues        
Oil and gas revenues $ 354,182 $ 241,842 $ 686,029 $ 483,493
Well services and midstream revenues 18,196 12,740 35,868 19,393
Total revenues 372,378 254,582 721,897 502,886
Expenses        
Lease operating expenses 40,553 18,266 80,542 37,755
Well services and midstream operating expenses 8,769 6,644 19,689 9,558
Marketing, transportation and gathering expenses 7,114 10,779 12,300 14,168
Production taxes 34,493 21,397 66,296 43,486
Depreciation, depletion and amortization 97,276 66,790 188,548 133,051
Exploration expenses 475 392 855 2,249
Impairment of oil and gas properties 42 208 804 706
General and administrative expenses 20,751 16,656 44,271 30,510
Total expenses 209,473 141,132 413,305 271,483
Gain on sale of properties 3,640 0 187,033 0
Operating income (loss) 166,545 113,450 495,625 231,403
Other income (expense)        
Net gain (loss) on derivative instruments (65,570) 12,591 (83,173) (2,021)
Interest expense, net of capitalized interest (38,990) (21,392) (79,148) (42,575)
Other income (expense) 135 294 288 1,074
Total other income (expense) (104,425) (8,507) (162,033) (43,522)
Income before income taxes 62,120 104,943 333,592 187,881
Income tax expense 23,287 37,824 124,806 68,911
Net income $ 38,833 $ 67,119 $ 208,786 $ 118,970
Earnings per share:        
Basic (in dollars per share) $ 0.39 $ 0.73 $ 2.10 $ 1.29
Diluted (in dollars per share) $ 0.39 $ 0.72 $ 2.08 $ 1.28
Weighted average shares outstanding:        
Basic (in shares) 99,663 92,399 99,612 92,387
Diluted (in shares) 100,260 92,702 100,328 92,812