Fair Value Measurement - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Gross Fair Value, Assets	$ 21,755	$ 3,879
Effect of Counterparty Netting, Assets	(1,105)	(3,879)
Net Carrying Value on Balance Sheet, Assets	20,650	0
Gross Fair Value, Liabilities	1,105	20,598
Effect of Counterparty Netting, Liabilities	(1,105)	(3,879)
Net Carrying Value on Balance Sheet, Liabilities	0	16,719
Commodity Derivative Instruments | Fair Value Measurements, Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Effect of Counterparty Netting, Assets	(1,105)	(3,879)
Net Carrying Value on Balance Sheet, Assets	20,650	0
Effect of Counterparty Netting, Liabilities	(1,105)	(3,879)
Net Carrying Value on Balance Sheet, Liabilities	0	16,719
Commodity Derivative Instruments | Fair Value Measurements, Recurring Basis | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Gross Fair Value, Assets	21,755	3,879
Gross Fair Value, Liabilities	$ 1,105	$ 20,598