Derivative Financial Instruments (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Summary of gross liability balances of derivative instruments
Total	$ (3,505)	$ (24,954)
Gross amounts netted in the condensed consolidated balance sheets	0	0
Net amounts presented in the condensed consolidated balance sheets	(3,505)	(24,954)
Current assets
Derivative [Line Items]
Gross amounts of recognized assets	89,456
Gross amounts netted in the condensed consolidated balance sheets	(89,396)
Oil, natural gas and natural gas liquids (NGL) derivatives	60
Other assets
Derivative [Line Items]
Gross amounts of recognized assets	29,939
Gross amounts netted in the condensed consolidated balance sheets	(29,654)
Oil, natural gas and natural gas liquids (NGL) derivatives	285
Current liabilities
Summary of gross liability balances of derivative instruments
Gross amounts of recognized liabilities	(93,037)	(24,203)
Gross amounts netted in the condensed consolidated balance sheet	89,396	0
Oil, natural gas and natural gas liquids (NGL) derivatives	(3,641)	(24,203)
Other liabilities
Summary of gross liability balances of derivative instruments
Gross amounts of recognized liabilities	(29,863)	(751)
Gross amounts netted in the condensed consolidated balance sheet	29,654	0
Oil, natural gas and natural gas liquids (NGL) derivatives	$ (209)	$ (751)

Derivative Asset (Liability), Net

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Derivative Asset (Liability) Subject to Master Netting Arrangement

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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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Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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