Three Months Ended June 30,

Six Months Ended June 30,

2020

2019

2020

2019

(In thousands)

Income tax provision at statutory rate

$

(10,105)

$

13,216

$

(15,794)

$

28,506

Percentage depletion allowance

(11,768)

(3,457)

(5,600)

(7,764)

State taxes, net of effect of federal taxes

(1,584)

831

(1,502)

1,843

Change in valuation allowance

19,531

(11,292)

20,381

(23,805)

Current expense associated with uncertain tax positions

5,132

844

3,101

1,437

AMT sequestration refund

—

(1,171)

—

Other, net

—

(51)

—

(56)

Provision for (benefit from) income taxes

$

1,206

$

91

$

(585)

$

161