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CONSOLIDATED STATEMENTS 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 sales | $ 107,820 | $ 90,329 | $ 202,840 | $ 194,101
Gain on sale of oil and gas properties | 81 | 20,338 | 81 | 27,065
Total revenues | 107,901 | 110,667 | 202,921 | 221,166
Operating expenses: |  |  |  |
Production taxes | 3,883 | 2,861 | 6,004 | 6,108
Gathering and transportation | 4,354 | 7,106 | 8,556 | 14,821
Lease operating | 12,962 | 12,193 | 26,168 | 25,651
Exploration | 9,754 | 37 | 12,347 | 1,390
Depreciation, depletion and amortization | 85,244 | 85,675 | 170,211 | 162,986
General and administrative, net | 9,056 | 9,033 | 17,843 | 17,831
Impairment of oil and gas properties | 652 | 5,301 | 652 | 5,350
Total operating expenses | 125,905 | 122,206 | 241,781 | 234,137
Operating loss | (18,004) | (11,539) | (38,860) | (12,971)
Other income (expenses): |  |  |  |
Gain on sale of marketable securities |  |  | 7,877 | 26,621
Realized gain from derivatives | 2,881 | 2,719 | 5,201 | 1,365
Unrealized gain (loss) from derivatives | 640 | 34,797 | (8,127) | 24,610
Interest and other income | 196 | 283 | 441 | 522
Interest expense | (19,240) | (13,351) | (36,818) | (25,654)
Total other income (expenses) | (15,523) | 24,448 | (31,426) | 27,464
Income (loss) before income taxes | (33,527) | 12,909 | (70,286) | 14,493
Benefit from income taxes | 11,996 | 3,801 | 24,238 | 3,634
Income (loss) from continuing operations | (21,531) | 16,710 | (46,048) | 18,127
Income (loss) from discontinued operations, net of income taxes | 151,236 | (9,545) | 148,609 | (9,587)
Net income | $ 129,705 | $ 7,165 | $ 102,561 | $ 8,540
Net income (loss) per share: |  |  |  |
Income (loss) from continuing operations, Basic | $ (0.45) | $ 0.35 | $ (0.95) | $ 0.38
Income (loss) from discontinued operations, Basic | $ 3.13 | $ (0.20) | $ 3.07 | $ (0.20)
Net income, Basic | $ 2.68 | $ 0.15 | $ 2.12 | $ 0.18
Income (loss) from continuing operations, Diluted | $ (0.45) | $ 0.35 | $ (0.95) | $ 0.38
Income (loss) from discontinued operations, Diluted | $ 3.13 | $ (0.20) | $ 3.07 | $ (0.20)
Net income, Diluted | $ 2.68 | $ 0.15 | $ 2.12 | $ 0.18
Dividends per common share | $ 0.125 |  | $ 0.125 |
Weighted average shares outstanding: |  |  |  |
Basic | 46,754 | 46,426 | 46,742 | 46,399
Diluted | 46,754 | 46,426 | 46,742 | 46,399

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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