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Derivative Instruments (Tables)
9 Months Ended
Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Effect of Cash Flow Hedges on the Consolidated Balance Sheet
Effect of Cash Flow Hedges on the Consolidated Balance Sheets at September 30, 2018 and December 31, 2017:    
 
Commodity Derivatives
Period
Balance Sheet
Location
Fair Value
September 30, 2018
Derivative liability
$

December 31, 2017
Derivative asset
$
1,174

December 31, 2017
Derivative liability
$
(731
)
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 September 30, 2018 and 2017:
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 - September 30, 2018
$

 
Oil and gas sales
 
$
(401
)
Commodity Derivatives - September 30, 2017
$
591

 
Oil and gas sales
 
$
618



Effect of Cash Flow Hedges on the Consolidated Statements of Operations and Comprehensive Loss for the nine months ended September 30, 2018 and 2017:
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 - September 30, 2018
$
(990
)
 
Oil and gas sales
 
$
(222
)
Commodity Derivatives - September 30, 2017
$
5,636

 
Oil and gas sales
 
$
404