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Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss)
The following table represents the changes in accumulated other comprehensive income (loss), net of tax, for the year ended December 31, 2016 (in thousands):
 
Gains and Losses on Cash Flow Hedges
 
Change in Valuation Allowance
 
Total
Balance as of December 31, 2015
$
947

 
$
—

 
$
947

Other comprehensive income before reclassifications:
 
 
 
 
 
Change in fair value of derivatives
(4,447
)
 
—

 
(4,447
)
Income tax effect
1,654

 
(1,654
)
 
—

Net of tax
(2,793
)
 
(1,654
)
 
(4,447
)
Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
Oil and gas sales
(1,811
)
 
—

 
(1,811
)
Income tax effect
674

 
(113
)
 
561

Net of tax
(1,137
)
 
(113
)
 
(1,250
)
Net other comprehensive loss
(3,930
)
 
(1,767
)
 
(5,697
)
Balance as of December 31, 2016
$
(2,983
)
 
$
(1,767
)
 
$
(4,750
)
    
The following table represents the changes in accumulated other comprehensive income (loss), net of tax, for the year ended December 31, 2017 (in thousands):

Gains and Losses on Cash Flow Hedges
 
Change in Valuation Allowance
 
Total
Balance as of December 31, 2016
$
(2,983
)
 
$
(1,767
)
 
$
(4,750
)
Other comprehensive income before reclassifications:


 
—

 


Change in fair value of derivatives
6,654

 
—

 
6,654

Income tax effect
(2,475
)
 
1,767

 
(708
)
Net of tax
4,179

 
1,767

 
5,946

Amounts reclassified from accumulated other comprehensive income:

 

 

Oil and gas sales
(1,461
)
 
—

 
(1,461
)
Income tax effect
543

 
—

 
543

Net of tax
(918
)
 
—

 
(918
)
Net other comprehensive loss
$
3,261

 
$
1,767

 
$
5,028

Balance as of December 31, 2017
$
278

 
$
—

 
$
278

The following table represents the changes in accumulated other comprehensive income (loss), net of tax, for the year ended December 31, 2018 (in thousands):        
 
Gains and Losses on Cash Flow Hedges
Balance as of December 31, 2017
$
278

Other comprehensive income before reclassifications:
 
Change in fair value of derivatives
(990
)
Income tax effect
238

Net of tax
(752
)
Amounts reclassified from accumulated other comprehensive income:
 
Oil and gas sales
622

Income tax effect
(148
)
Net of tax
474

Net other comprehensive loss
(278
)
Balance as of December 31, 2018
$
—