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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 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 Sheet at December 31, 2017:
 
Commodity Derivatives
Period
Balance Sheet
Location
Fair Value
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 Statement of Operations for years ended December 31, 2018, 2017 and 2016:
Instrument
Amount of Gain (Loss)
Recognized in Other
Comprehensive Income
 
Location of
Gain (Loss) Reclassified
into Income
 
Amount of Gain (Loss) Reclassified into
Income
Commodity Derivatives at December 31, 2018
$
(990
)
 
Oil and gas sales
 
$
(622
)
Commodity Derivatives at December 31, 2017
$
6,654

 
Oil and gas sales
 
$
1,461

Commodity Derivatives at December 31, 2016
$
(4,447
)
 
Oil and gas sales
 
$
1,811