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Derivative Instruments (Tables)
 6 Months Ended
Jun. 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 June 30, 2018 and December 31, 2017:    
 
Commodity Derivatives
Period
Balance Sheet
Location
Fair Value
June 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 June 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 - June 30, 2018
$
(445
)
 
Oil and gas sales
 
$
(307
)
Commodity Derivatives - June 30, 2017
$
2,179

 
Oil and gas sales
 
$
108



Effect of Cash Flow Hedges on the Consolidated Statements of Operations and Comprehensive Loss for the six months ended June 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 - June 30, 2018
$
(990
)
 
Oil and gas sales
 
$
233

Commodity Derivatives - June 30, 2017
$
5,045

 
Oil and gas sales
 
$
(214
)