Fair Value Measurements - Level 3 Measurements of Derivative Commodity Instruments (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) $ / bbl $ / gal
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Derivative Asset	$ 48,597
Derivative liabilities	(983)
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTI/WTI | 2017
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Derivative Asset	$ 3,087
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTI/WTI | 2017 | Minimum
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Price per barrel (in dollars per Bbl) | $ / bbl	(1.34)
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTI/WTI | 2017 | Maximum
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Price per barrel (in dollars per Bbl) | $ / bbl	(1.26)
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTI/WTI | 2018
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Derivative liabilities	$ 387
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTI/WTI | 2018 | Minimum
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Price per barrel (in dollars per Bbl) | $ / bbl	(1.07)
Discounted Cash Flow Valuation Technique | Level 3 | Oil Basis - WTI/WTI | 2018 | Maximum
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Price per barrel (in dollars per Bbl) | $ / bbl	(1.04)
Discounted Cash Flow Valuation Technique | Level 3 | Natural Gas Liquids | 2017
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Derivative Asset	$ (393)
Price per gallon (in dollars per gal) | $ / gal	0.57
Discounted Cash Flow Valuation Technique | Level 3 | Natural Gas Liquids | 2018
Fair Value Inputs, Derivatives, Quantitative Information [Line Items]
Derivative Asset	$ 4,552
Price per gallon (in dollars per gal) | $ / gal	0.55