Derivative Financial Instruments (Details 2) $ in Thousands	Dec. 31, 2019 USD ($) bbl $ / bbl	Dec. 31, 2018 USD ($)
Offsetting Derivative Assets [Abstract]
Derivative liability		$ (49,846)
Total	$ (3,881)
Derivative Asset (Liability) Subject to Master Netting Arrangement	0
Derivative Asset (Liability), Net	(3,881)
Offsetting Derivative Liabilities [Abstract]
Derivative Asset		0
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized liabilities		53,136
Gross amounts netted in the consolidated balance sheet		3,207
Derivative liability		49,929
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized assets	442,291
Gross amounts netted in the consolidated balance sheets	(442,291)
Derivative Asset	0
Other Assets
Offsetting Derivative Liabilities [Abstract]
Gross amounts of recognized assets	280,397
Gross amounts netted in the consolidated balance sheets	(280,397)
Derivative Asset	0
Long-term liabilities
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized liabilities	(282,381)	(83)
Gross amounts netted in the consolidated balance sheet	(280,397)	0
Derivative liability	(1,984)	(83)
Current liabilities
Offsetting Derivative Assets [Abstract]
Gross amounts of recognized liabilities	(444,188)	(3,207)
Gross amounts netted in the consolidated balance sheet	(442,291)	(3,207)
Derivative liability	(1,897)	$ 0
Open Swap Contracts
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ (4,511)
Open Swap Contracts \| Oil, Calculation Period One [Member]
Derivatives, Fair Value [Line Items]
Notional Quantity (Bbl) \| bbl	9,774,000
Fixed price (usd per Bbl) \| $ / bbl	0.61
Derivative Assets (Liabilities), at Fair Value, Net	$ (2,528)
Open Swap Contracts \| Oil, Calculation Period Two
Derivatives, Fair Value [Line Items]
Notional Quantity (Bbl) \| bbl	6,480,000
Fixed price (usd per Bbl) \| $ / bbl	0.82
Derivative Assets (Liabilities), at Fair Value, Net	$ (1,523)
Open Swap Contracts \| Oil, Calculation Period Three [Member]
Derivatives, Fair Value [Line Items]
Notional Quantity (Bbl) \| bbl	3,600,000
Fixed price (usd per Bbl) \| $ / bbl	0.90
Derivative Assets (Liabilities), at Fair Value, Net	$ (460)

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