Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Gross fair value amount	$ 34,891	$ 50,264
Effect of Counterparty Netting, Assets	(3,478)	(2,226)
Total net carrying value on Balance Sheet, assets	31,413	48,038
Gross Fair Value, Liabilities	3,523	2,226
Effect of Counterparty Netting, Liabilities	(3,478)	(2,226)
Total net carrying value on Balance Sheet, liabilities	45	0
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	(3,478)	(2,226)
Total net carrying value on Balance Sheet, assets	31,413	48,038
Effect of Counterparty Netting, Liabilities	(3,478)	(2,226)
Total net carrying value on Balance Sheet, liabilities	45	0
Commodity Derivative Instruments | Fair Value Measurements, Recurring Basis | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Gross fair value amount	0	0
Gross Fair Value, Liabilities	0	0
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 amount	34,891	50,264
Gross Fair Value, Liabilities	3,523	2,226
Commodity Derivative Instruments | Fair Value Measurements, Recurring Basis | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Gross fair value amount	0	0
Gross Fair Value, Liabilities	$ 0	$ 0