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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenues: |  |  |  |
Total oil and gas sales | $ 61,449 | $ 61,471 | $ 134,042 | $ 115,272
Operating expenses: |  |  |  |
Production taxes | 1,112 | 1,143 | 2,952 | 2,240
Gathering and transportation | 4,398 | 3,545 | 8,732 | 7,673
Lease operating | 7,948 | 9,433 | 17,721 | 19,322
Depreciation, depletion and amortization | 26,798 | 30,321 | 53,950 | 60,226
General and administrative | 6,956 | 6,559 | 12,972 | 12,960
Loss on sale of oil and gas properties | 6,838 |  | 35,438 |
Total operating expenses | 54,050 | 51,001 | 131,765 | 102,421
Operating income | 7,399 | 10,470 | 2,277 | 12,851
Other income (expenses): |  |  |  |
Gain (loss) from derivative financial instruments | (1,638) | 5,295 | 964 | 13,155
Other income | 327 | 65 | 393 | 228
Interest expense | (40,213) | (36,755) | (79,063) | (69,655)
Total other income (expenses) | (41,524) | (31,395) | (77,706) | (56,272)
Loss before income taxes | (34,125) | (20,925) | (75,429) | (43,421)
Benefit from (provision for) income taxes | 122 | (517) | (460) | (952)
Net loss | $ (34,003) | $ (21,442) | $ (75,889) | $ (44,373)
Net loss per share – basic and diluted | $ (2.22) | $ (1.45) | $ (4.99) | $ (3.06)
Weighted average shares outstanding – basic and diluted | 15,340 | 14,749 | 15,212 | 14,488
Natural Gas Sales |  |  |  |
Revenues: |  |  |  |
Total oil and gas sales | $ 56,265 | $ 50,437 | $ 115,808 | $ 91,377
Oil Sales |  |  |  |
Revenues: |  |  |  |
Total oil and gas sales | $ 5,184 | $ 11,034 | $ 18,234 | $ 23,895

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