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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