b'The discussion of the results of operations and the period-to-period comparisons presented belowanalyze our historical results. The following discussion may not be indicative of future results.Year Ended December 31, 2018 vs. 2017Years EndedDecember 31, Increase2018 2017 (Decrease)(In thousands)Revenues and other income:Oil and gas revenue . . . . . . . . . . . . . . . . . . . . . $886,666 $ 578,139 $308,527Gain on sale of assets . . . . . . . . . . . . . . . . . . . 7,6667,666Other income, net . . . . . . . . . . . . . . . . . . . . . . 8,037 58,697 (50,660)Total revenues and other income . . . . . . . . . . 902,369 636,836 265,533Costs and expenses:Oil and gas production . . . . . . . . . . . . . . . . . . . 224,727 126,850 97,877Facilities insurance modifications, net . . . . . . . . 6,955 (820) 7,775Exploration expenses . . . . . . . . . . . . . . . . . . . . 301,492 216,050 85,442General and administrative . . . . . . . . . . . . . . . . 99,856 68,302 31,554Depletion and depreciation . . . . . . . . . . . . . . . 329,835 255,203 74,632Interest and other financing costs, net . . . . . . . . 101,176 77,595 23,581Derivatives, net . . . . . . . . . . . . . . . . . . . . . . . . (31,430) 59,968 (91,398)(Gain) loss on equity method investments, net . . (72,881) 6,252 (79,133)Other expenses, net . . . . . . . . . . . . . . . . . . . . . (6,501) 5,291 (11,792)Total costs and expenses . . . . . . . . . . . . . . . . 953,229 814,691 138,538Loss before income taxes . . . . . . . . . . . . . . . . . . . (50,860) (177,855) 126,995Income tax expense . . . . . . . . . . . . . . . . . . . . . 43,131 44,937 (1,806)Net loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $(93,991) $(222,792) $128,801The results of operations for our equity method investments are presented in (Gain) loss onequity method investments, net. See Item 8. Financial Statements and Supplementary DataNote 7Equity Method Investments for additional information regarding our equity methodinvestments.Oil and gas revenue. Oil and gas revenue increased by $308.5 million primarily as a result ofhigher oil prices during the year ended December 31, 2018, compared to the year ended December 31,2017. We sold 12,673 MBbl at an average realized price per barrel of $69.00 in 2018 and 10,761 MBblat an average realized price per barrel of $53.73 in 2017. The increase in barrels sold is primarily aresult of the DGE acquisition which was completed in September 2018.Gain on sale of assets. In August 2018, we closed a farm-out agreement with Trident. As part ofthe transaction, we received proceeds in excess of our book basis resulting in a gain of $7.7 million.Other income. Other income, net decreased by $50.7 million as we recognized $58.7 million ofLOPI proceeds, net during the year ended December 31, 2017 related to the turret bearing issue onthe Jubilee FPSO. The LOPI claim was finalized in June 2017.Oil and gas production. Oil and gas production costs increased by $97.9 million during the yearended December 31, 2018 as compared to the year ended December 31, 2017 primarily as a result ofthe impact of LOPI claim insurance proceeds recognized in 2017 related to increased costs due toturret issues, which reduced overall operating costs as well as credit accrual adjustments from the84'