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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
A reconciliation of the statutory federal income tax provision (benefit) at the statutory rate to the actual provision for (benefit from) income taxes follows:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
Income tax provision (benefit) at statutory rate
$
8,387

 
$
13,118

 
$
20,870

 
$
31,496

Percentage depletion allowance
(2,488
)
 
(5,692
)
 
(7,095
)
 
(12,731
)
State taxes, net of effect of federal taxes
583

 
408

 
1,337

 
891

Change in valuation allowance
(7,317
)
 
(8,316
)
 
(17,956
)
 
(20,218
)
Other, net
(2,531
)
 
801

 
(1,066
)
 
1,721

Provision for (benefit from) income taxes
$
(3,366
)
 
$
319

 
$
(3,910
)
 
$
1,159