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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss)
The following table represents the changes in accumulated other comprehensive income (loss), net of tax, for the three month period ended March 31, 2018 (in thousands):
 
Gains and Losses on Cash Flow Hedges
 
Change in Valuation Allowance
 
Total
Balance as of December 31, 2017
$
278

 
$
—

 
$
278

Other comprehensive income before reclassifications:
 
 
 
 
 
 Change in fair value of derivatives
(545
)
 
—

 
(545
)
 Income tax effect
131

 
(131
)
 
—

 Net of tax
(414
)
 
(131
)
 
(545
)
Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
 Oil and gas sales
(540
)
 
—

 
(540
)
 Income tax effect
130

 
(41
)
 
89

 Net of tax
(410
)
 
(41
)
 
(451
)
Net other comprehensive loss
(824
)
 
(172
)
 
(996
)
Balance as of March 31, 2018
$
(546
)
 
$
(172
)
 
$
(718
)