Derivative Financial Instruments (Details 2) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Summary of gross liability balances of derivative instruments
Total	$ 4,127	$ 49,846
Gross amounts netted in the condensed consolidated balance sheets	0	0
Net amounts presented in the condensed consolidated balance sheets	4,127	49,846
Current assets
Derivative [Line Items]
Gross amounts of recognized assets	9,368	53,136
Gross amounts netted in the condensed consolidated balance sheets	(4,573)	(3,207)
Oil, natural gas and natural gas liquids (NGL) derivatives	4,795	49,929
Current liabilities
Summary of gross liability balances of derivative instruments
Gross amounts of recognized liabilities	(4,734)	(3,207)
Gross amounts netted in the condensed consolidated balance sheet	4,573	3,207
Oil, natural gas and natural gas liquids (NGL) derivatives	(161)	0
Other liabilities
Summary of gross liability balances of derivative instruments
Gross amounts of recognized liabilities	(507)	(83)
Gross amounts netted in the condensed consolidated balance sheet	0	0
Oil, natural gas and natural gas liquids (NGL) derivatives	$ (507)	$ (83)

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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