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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

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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64954-109465 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(15)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 15 -Article 4 + Details
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