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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Revenues |  |
Realized gain (loss) on derivative instruments, net | $ 6,173 | $ (1,371)
Unrealized (loss) on derivative instruments | (190) | (2,777)
Other income | 182 | 84
Total Revenues | 58,421 | 104,824
Costs and Expenses |  |
Lease operating expense | 23,028 | 33,461
Field service expense | 9,006 | 15,446
Depreciation, depletion, amortization and accretion on discounted liabilities | 28,176 | 36,156
General and administrative expense | 15,027 | 15,639
Total Costs and Expenses | 75,237 | 100,702
Gain on Sale and Exchange of Assets | 15,836 | 4,574
(Loss) Income from Operations | (980) | 8,696
Other Income and Expenses |  |
Less: Interest expense | 1,902 | 3,635
Add: Interest income | 2 | 19
(Loss) Income Before (Benefit from) Provision for Income Taxes | (2,880) | 5,080
(Benefit from) Provision for Income Taxes | (517) | 1,421
Net (Loss) Income | (2,363) | 3,659
Less: Net (Loss) Income Attributable to Non-Controlling Interest | (47) | 183
Net (Loss) Income Attributable to PrimeEnergy | $ (2,316) | $ 3,476
Basic (Loss) Income Per Common Share | $ (1.16) | $ 1.72
Diluted (Loss) Income Per Common Share | $ (1.16) | $ 1.25
Oil sales [Member] |  |
Revenues |  |
Oil, gas and service income | $ 27,865 | $ 68,366
Natural gas sales [Member] |  |
Revenues |  |
Oil, gas and service income | 4,202 | 6,539
Natural gas liquids sales [Member] |  |
Revenues |  |
Oil, gas and service income | 4,906 | 9,110
Oil and gas service [Member] |  |
Costs and Expenses |  |
Field service expense | 11,120 | 19,214
Administrative Service [Member] |  |
Revenues |  |
Oil, gas and service income | $ 4,163 | $ 5,659

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