b'KOSMOS ENERGY LTD.Notes to Consolidated Financial Statements (Continued)9. Derivative Financial Instruments (Continued)The following tables disclose the Companys derivative instruments as of December 31, 2018 and2017 and gain/(loss) from derivatives during the years ended December 31, 2018, 2017 and 2016.Estimated Fair ValueAsset (Liability)December 31,Type of Contract Balance Sheet Location 2018 2017(In thousands)Derivatives not designated as hedging instruments:Derivative assets:Commodity(1) . . . . . . . . . . . . . . . . . . . . . . . Derivatives assetscurrent $ 38,785 $ 665Interest rate . . . . . . . . . . . . . . . . . . . . . . . . . Derivatives assetscurrent1,017Commodity(2) . . . . . . . . . . . . . . . . . . . . . . . Derivatives assetslong-term 14,312 39Derivative liabilities:Commodity(3) . . . . . . . . . . . . . . . . . . . . . . . Derivatives liabilitiescurrent (12,172) (67,531)Commodity(4) . . . . . . . . . . . . . . . . . . . . . . . Derivatives liabilitieslong-term (10,181) (30,209)Total derivatives not designated as hedginginstruments. . . . . . . . . . . . . . . . . . . . . . . . $ 30,744 $(96,019)(1) Includes $0.4 million and zero as of December 31, 2018 and December 31, 2017, respectively whichrepresents our provisional oil sales contract. Also, includes net deferred premiums payable of$1.6 million and net deferred premiums receivable of $0.8 million related to commodity derivativecontracts as of December 31, 2018 and 2017, respectively.(2) Includes net deferred premiums payable of $1.3 million and net deferred premiums receivable of$0.1 million related to commodity derivative contracts as of December 31, 2018 and 2017,respectively.(3) Includes net deferred premiums payable of $18.0 million and $5.6 million related to commodityderivative contracts as of December 31, 2018 and 2017, respectively.(4) Includes net deferred premiums payable of $0.5 million and $4.8 million related to commodityderivative contracts as of December 31, 2018 and 2017, respectively.Amount of Gain/(Loss)Years Ended December 31,Type of Contract Location of Gain/(Loss) 2018 2017 2016(In thousands)Derivatives not designated as hedging instruments:Commodity(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil and gas revenue $(1,963) $(12,502) $ 2,538Commodity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Derivatives, net 31,430 (59,968) (48,021)Interest rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interest expense 493 648 (1,076)Total derivatives not designated as hedginginstruments . . . . . . . . . . . . . . . . . . . . . . . . . . $29,960 $(71,822) $(46,559)(1) Amounts represent the change in fair value of our provisional oil sales contracts.134'