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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 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 month period ended June 30, 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 - June 30, 2018
$
(445
)
 
Oil and gas sales
 
$
(307
)

Effect of Cash Flow Hedges on the Consolidated Statements of Operations and Comprehensive Loss for the six month period ended June 30, 2018:
Instrument
Amount of Gain (Loss) Recognized in Other
Comprehensive Income
 
Location of
Gain Reclassified
into Income
 
Amount of Gain (Loss) Reclassified into
Oil and Gas Sales
Commodity Derivatives - June 30, 2018
$
(990
)
 
Oil and gas sales
 
$
233