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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2019
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)

A reconciliation of the statutory federal income tax provision at the statutory rate to the actual provision for (benefit from) income taxes follows:

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
 
(In thousands)
Income tax provision at statutory rate
$
22,494

 
$
16,375

 
$
51,000

 
$
37,245

Percentage depletion allowance
(6,347
)
 
(5,964
)
 
(14,111
)
 
(13,059
)
State taxes, net of effect of federal taxes
1,825

 
4,528

 
3,668

 
5,865

Change in valuation allowance
(19,120
)
 
(44,278
)
 
(42,925
)
 
(62,234
)
Current expense associated with uncertain tax positions
1,495

 
511

 
2,932

 
(599
)
Impact of Tax Cuts and Jobs Act of 2017
—

 
(19,780
)
 
—

 
(19,780
)
Other, net
—

 
3,393

 
(56
)
 
3,437

Provision for (benefit from) income taxes
$
347

 
$
(45,215
)
 
$
508

 
$
(49,125
)