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Other Comprehensive Income
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Other Comprehensive Income
Other Comprehensive Income
The following table represents the changes in accumulated other comprehensive income (loss), net of tax, for the year ended December 31, 2014 (in thousands):    
 
Gains and Losses on Cash Flow Hedges
 
Change in Valuation Allowance
 
Total
Balance as of December 31, 2013
$
(688
)
 
$
(408
)
 
$
(1,096
)
Other comprehensive income before reclassifications:
 
 
 
 
 
Change in fair value of derivatives
6,683

 
 
 
6,683

Income tax effect
(2,487
)
 
408

 
(2,079
)
Net of tax
4,196

 
408

 
4,604

Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
Oil and gas sales
3,044

 
 
 
3,044

Income tax effect
(1,132
)
 
—

 
(1,132
)
Net of tax
1,912

 
—

 
1,912

Net other comprehensive income
6,108

 
408

 
6,516

Balance as of December 31, 2014
$
5,420

 
$
—

 
$
5,420

The following table represents the changes in accumulated other comprehensive income (loss), net of tax, for the year ended December 31, 2015 (in thousands):        
 
Gains and Losses on Cash Flow Hedges
Balance as of December 31, 2014
$
5,420

Other comprehensive income before reclassifications:
 
Change in fair value of derivatives
9,991

Income tax effect
(3,716
)
Net of tax
6,275

Amounts reclassified from accumulated other comprehensive income:
 
Oil and gas sales
(17,114
)
Income tax effect
6,366

Net of tax
(10,748
)
Net other comprehensive loss
(4,473
)
Balance as of December 31, 2015
$
947