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Income Taxes (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
Income tax provision (benefit) at statutory rate
$
16,375

 
$
23,347

 
$
37,245

 
$
54,843

Percentage depletion allowance
(5,964
)
 
(7,708
)
 
(13,059
)
 
(20,439
)
State taxes, net of effect of federal taxes
4,528

 
728

 
5,865

 
1,619

Change in valuation allowance
(44,278
)
 
(19,118
)
 
(62,234
)
 
(39,336
)
Current expense associated with uncertain tax positions
511

 
1,127

 
(599
)
 
2,762

Impact of Tax Cut and Jobs Act of 2017
(19,780
)
 
—

 
(19,780
)
 
—

Other, net
3,393

 
(19
)
 
3,437

 
67

Benefit from income taxes
$
(45,215
)
 
$
(1,643
)
 
$
(49,125
)
 
$
(484
)