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Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Other Comprehensive Income (Loss)
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
$
—