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Income Taxes
 6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes

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 June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
(In thousands)
Income tax provision at statutory rate
$
13,216

 
$
8,387

 
$
28,506

 
$
20,870

Percentage depletion allowance
(3,457
)
 
(2,488
)
 
(7,764
)
 
(7,095
)
State taxes, net of effect of federal taxes
831

 
583

 
1,843

 
1,337

Change in valuation allowance
(11,292
)
 
(7,317
)
 
(23,805
)
 
(17,956
)
Current expense associated with uncertain tax positions
844

 
792

 
1,437

 
2,181

Other, net
(51
)
 
(3,323
)
 
(56
)
 
(3,247
)
Provision for (benefit from) income taxes
$
91

 
$
(3,366
)
 
$
161

 
$
(3,910
)