ITEM 6. SELECTED FINANCIAL DATA Statement of Operations Data: The historical financial data presented in the table below as of and for each of the years in the five- year period ended December 31, 2013 are derived from our consolidated financial statements. The financial results are not necessarily indicative of our future operations or future financial results. The data presented below should be read in conjunction with our consolidated financial statements and the notes thereto and “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” During 2013, we divested all of our interests in our West Texas operations. Accordingly, we have adjusted the presentation of selected financial data to reflect these operations on a discontinued basis. (1) Includes ad valorem taxes. (2) Basic and diluted weighted average shares are the same due to the net loss from continuing operations. Year Ended December 31, 2009 2010 2011 2012 2013 (In thousands, except per share data) Revenues: Oil sales ...................................................... $ 39,457 $ 48,848 $ 80,244 $ 181,163 $ 231,837 Natural gas sales ................................................ 253,126 300,293 354,123 203,651 188,453 Total oil and gas sales ......................................... 292,583 349,141 434,367 384,814 420,290 Gain on sales of oil and gas properties ............................... 213 — — 24,271 — Total revenues ............................................... 292,796 349,141 434,367 409,085 420,290 Operating expenses: Production taxes ................................................ 8,643 9,894 3,670 11,727 14,524 Gathering and transportation ...................................... 8,696 17,256 28,491 26,265 17,245 Lease operating (1) ............................................... 53,560 53,525 46,552 51,248 52,844 Exploration .................................................... 907 2,605 10,148 61,449 33,423 Depreciation, depletion and amortization ............................ 213,238 213,809 290,776 343,858 337,134 General and administrative, net .................................... 39,172 37,200 35,172 33,798 34,767 Impairment of oil and gas properties ................................ 115 224 60,817 25,368 652 Loss on sales of oil and gas properties ............................... — 26,632 57 — 2,033 Total operating expenses ....................................... 324,331 361,145 475,683 553,713 492,622 Operating loss .................................................... (31,535) (12,004) (41,316) (144,628) (72,332) Other income (expenses): Gain on sale of marketable securities ................................ — 16,529 35,118 26,621 7,877 Gains (losses) on derivative financial instruments ...................... — — — 21,256 (8,388) Loss on early extinguishment of debt ................................ — — (1,096) — (17,854) Other income .................................................. 378 499 790 944 1,059 Interest expense ................................................ (16,086) (29,456) (41,592) (57,906) (73,242) Total other income (expenses) ................................... (15,708) (12,428) (6,780) (9,085) (90,548) Loss from continuing operations before income taxes ..................... (47,243) (24,432) (48,096) (153,713) (162,880) Benefit from income taxes .......................................... 10,772 4,846 14,624 50,634 56,157 Loss from continuing operations ..................................... (36,471) (19,586) (33,472) (103,079) (106,723) Income from discontinued operations ................................. — — — 3,019 147,752 Net income (loss) ................................................. $ (36,471) $ (19,586) $ (33,472) $(100,060) $ 41,029 Basic net income (loss) per share: .................................... Loss from continuing operations ................................... $ (0.81) $ (0.43) $ (0.73) $ (2.22) $ (2.22) Income from discontinued operations ............................... — — — 0.06 3.07 Net Income (loss) ............................................. $ (0.81) $ (0.43) $ (0.73) $ (2.16) $ 0.85 Diluted net income (loss) per share: ................................... Loss from continuing operations ................................... $ (0.81) $ (0.43) $ (0.73) $ (2.22) $ (2.22) Income from discontinued operations ............................... — — — 0.06 3.07 Net Income (loss) ............................................. $ (0.81) $ (0.43) $ (0.73) $ (2.16) $ 0.85 Dividends per common share ........................................ $ — $ — $ — $ — $ 0.375 Weighted average shares outstanding: ................................. Basic ......................................................... 45,004 45,561 45,997 46,422 46,553 Diluted (2) ...................................................... 45,004 45,561 45,997 46,422 46,553 45