Derivative Financial Instruments (Details)	1 Months Ended	12 Months Ended
	Feb. 28, 2017 $ / bbl MMBbls	Dec. 31, 2016 $ / bbl MBbls
Term January 2017 to December 2017 | Three-way Collars
Derivative Financial Instruments
Volumes (in MBbl) | MBbls		3,002
Weighted average deferred premium payable per Bbl		2.29
Weighted average sold put price per Bbl		30.00
Weighted average floor price per Bbl		45.00
Weighted average ceiling price per Bbl		57.50
Term January 2017 to December 2017 | Swaps with puts
Derivative Financial Instruments
Volumes (in MBbl) | MBbls		2,000
Weighted average swap price per Bbl		64.95
Weighted average sold put price per Bbl		50.00
Term January 2017 to December 2017 | Sold calls
Derivative Financial Instruments
Volumes (in MBbl) | MBbls		2,000
Weighted average ceiling price per Bbl		85.00
Term January 2017 to December 2017 | Swap with puts/calls
Derivative Financial Instruments
Volumes (in MBbl) | MBbls		2,000
Weighted average deferred premium payable per Bbl		2.13
Weighted average swap price per Bbl		72.50
Weighted average sold put price per Bbl		55.00
Weighted average purchased call price per Bbl		90.00
Term January 2018 to December 2018 | Three-way Collars
Derivative Financial Instruments
Volumes (in MBbl)	1,000	2,913
Weighted average deferred premium payable per Bbl	2.32	0.74
Weighted average sold put price per Bbl		41.57
Weighted average floor price per Bbl	50.00	56.57
Weighted average ceiling price per Bbl	62.00	65.90
Weighted average purchased call price per Bbl	70.00
Term January 2018 to December 2018 | Sold calls
Derivative Financial Instruments
Volumes (in MBbl) | MBbls		2,000
Weighted average ceiling price per Bbl		65.00
Term January 2019 to December 2019 | Sold calls
Derivative Financial Instruments
Volumes (in MBbl) | MBbls		913
Weighted average ceiling price per Bbl		80.00