Fair Value Measurements - Level 3 Measurements of Derivative Commodity Instruments (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / Mcf $ / bbl
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Derivative liabilities	$ (59,327)
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTI/WTI | 2016
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Derivative liabilities	$ (5,273)
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTI/WTI | 2016 | Minimum
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Price per barrel (in dollars per Bbl) | $ / bbl	(0.46)
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTI/WTI | 2016 | Maximum
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Price per barrel (in dollars per Bbl) | $ / bbl	(0.57)
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTS/WTI | 2016
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Derivative liabilities	$ (923)
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTS/WTI | 2016 | Minimum
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Price per barrel (in dollars per Bbl) | $ / bbl	(0.69)
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTS/WTI | 2016 | Maximum
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Price per barrel (in dollars per Bbl) | $ / bbl	(0.78)
Discounted Cash Flow Valuation Technique | Level 3 | Natural Gas Basis - Permian | 2016
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Derivative liabilities	$ 1,991
Price per cubic foot (in dollars per Mcf) | $ / Mcf	(0.12)
Discounted Cash Flow Valuation Technique | Level 3 | Natural Gas Basis - Permian | 2017
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Derivative liabilities	$ 2,463
Discounted Cash Flow Valuation Technique | Level 3 | Natural Gas Basis - Permian | 2017 | Minimum
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Price per cubic foot (in dollars per Mcf) | $ / Mcf	(0.13)
Discounted Cash Flow Valuation Technique | Level 3 | Natural Gas Basis - Permian | 2017 | Maximum
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Price per cubic foot (in dollars per Mcf) | $ / Mcf	(0.14)