Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Effect of Cash Flow Hedges on the Consolidated Statement of Operations

Effect of Cash Flow Hedges on the Consolidated Statements of Operations and Comprehensive Loss for the three months ended March 31, 2018:

Instrument	Amount of Gain Recognized in Other Comprehensive Income			Location of Gain Reclassified into Income	Amount of Gain (Loss) Reclassified into Oil and Gas Sales
Commodity Derivatives - March 31, 2018	$	(545	)	Oil and gas sales	$	540