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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
2018
2017
 
(In thousands)
Income tax provision (benefit) at statutory rate
$
12,483

$
18,376

Percentage depletion allowance
(4,607
)
(7,039
)
State taxes, net of effect of federal taxes
754

483

Change in valuation allowance
(10,639
)
(11,900
)
Other, net
1,465

920

 
$
(544
)
$
840