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Taxes (Tables)
12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
Significant components of the provision for (benefit from) income taxes are as follows:
 
Year Ended December 31, 2019
 
Year Ended December 31, 2018
 
Year Ended December 31, 2017
(In thousands)
 
 
 
 
 
Current:
 
 
 
 
 
Federal
$
(36
)
 
$
86

 
$
835

State
124

 
136

 
31

Total current
$
88

 
$
222

 
$
866

Deferred:
 
 
 
 
 
Federal
667

 
(52,309
)
 
(36,162
)
State
(507
)
 
(389
)
 
41

Total deferred
$
160

 
$
(52,698
)
 
$
(36,121
)
 
$
248

 
$
(52,476
)
 
$
(35,255
)

Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of the statutory federal income tax provision (benefit) at the statutory rate to the actual provision for (benefit from) income taxes follows:
 
Year Ended December 31, 2019
 
Year Ended December 31, 2018
 
Year Ended December 31, 2017
(In thousands)
 
 
 
 
 
Income tax provision (benefit) at statutory rate
$
49,150

 
$
54,621

 
$
71,118

Percentage depletion allowance
(17,743
)
 
(17,725
)
 
(31,255
)
State taxes, net of effect of federal taxes
(12,769
)
 
4,480

 
7,002

Change in valuation allowance
(24,206
)
 
(79,961
)
 
(410,983
)
Impact of Tax Cuts and Jobs Act of 2017

 
(17,645
)
 
332,345

Other, net
5,816

 
3,754

 
(3,482
)
Provision for (benefit from) income taxes
$
248

 
$
(52,476
)
 
$
(35,255
)

Schedule of Deferred Tax Assets and Liabilities
Significant components of the Company’s deferred tax assets and liabilities that result from carryforwards and temporary differences between the financial statement basis and tax basis of assets and liabilities are summarized as follows:
 
December 31, 2019
 
December 31, 2018
(In thousands)
 
 
 
Deferred tax assets:
 
 
 
Tax loss carryforwards
$
294,535

 
$
307,615

Tax credit carryforwards
5,297

 
5,394

Investment in partnerships
190,418

 
193,217

Other
20,387

 
28,747

Gross deferred tax assets
$
510,637

 
$
534,973

Valuation allowance
(506,316
)
 
(530,612
)
Total deferred tax assets
$
4,321

 
$
4,361

Deferred tax liabilities:
 
 
 
Plant and equipment
2,063

 
3,037

Other
2,178

 
1,154

Total deferred tax liabilities
$
4,241

 
$
4,191

Net deferred tax asset
$
80

 
$
170


Summary of Income Tax Contingencies
A reconciliation of the beginning and ending amounts of gross unrecognized tax benefits follows:
 
 
 (In thousands)
Balance at
December 31, 2016
$
7,455

Additions based on tax positions related to the current year

Additions for tax positions of prior years
3,928

Reductions as a result of lapses in the statute of limitations

Balance at
December 31, 2017
11,383

Additions based on tax positions of prior years
28,387

Additions for tax positions related to the current year
3,228

Reductions for tax positions of prior years
(634
)
Reductions as a result of lapses in the statute of limitations
(3,271
)
Balance at
December 31, 2018
39,093

Additions for tax positions related to the current year
2,980

Reductions for tax positions of prior years
(1,970
)
Reductions as a result of lapses in the statute of limitations
$
(374
)
Balance at
December 31, 2019
$
39,729