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Taxes (Tables)
12 Months Ended
Dec. 31, 2015
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
 
2015
 
2014
 
2013
 
(In thousands)
Current:
 
 
 
 
 
Federal
$

 
$

 
$

State
3

 
25

 
(647
)
Total current
3

 
25

 
(647
)
Deferred:
 
 
 
 
 
Federal
(329,393
)
 
18,535

 
(318,956
)
State
(43,990
)
 
7,074

 
(15,895
)
Total deferred
(373,383
)
 
25,609

 
(334,851
)
 
$
(373,380
)
 
$
25,634

 
$
(335,498
)
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
 
2015
 
2014
 
2013
 
(In thousands)
Income tax provision (benefit) at statutory rate
$
(1,150,283
)
 
$
(186,452
)
 
$
(378,463
)
Percentage depletion allowance
(19,035
)
 
(12,692
)
 
(15,796
)
Goodwill

 

 
70,301

State taxes, net of effect of federal taxes
(76,445
)
 
(3,903
)
 
(25,265
)
Change in valuation allowance
865,146

 
226,929

 
8,659

Other, net
7,237

 
1,752

 
5,066

 
$
(373,380
)
 
$
25,634

 
$
(335,498
)
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,
 
2015
 
2014
 
(In thousands)
Deferred tax assets:
 
 
 
Net operating loss carryforwards
$
1,086,332

 
$
871,848

Alternative minimum tax credit carryforwards
120,994

 
127,169

Reclamation and mine closure
121,276

 
114,430

Goodwill
38,671

 
50,072

Workers' compensation
42,835

 
38,924

Share based compensation
22,612

 
30,283

Acquired sales contracts
17,466

 
26,833

Retiree benefit plans
16,996

 
22,913

Contract obligations

 
15,693

Advance royalties
18,751

 

Losses from disposed operations resulting from Patriot Coal bankruptcy
39,287

 

Other, primarily accrued liabilities
45,303

 
64,503

Gross deferred tax assets
1,570,523

 
1,362,668

Valuation allowance
(1,135,399
)
 
(270,251
)
Total deferred tax assets
435,124

 
1,092,417

Deferred tax liabilities:
 
 
 
Plant and equipment
389,169

 
1,354,396

Deferred development
41,047

 
95,129

Investment in tax partnerships

 
7,377

Other
4,706

 
5,533

Total deferred tax liabilities
434,922

 
1,462,435

Net deferred (asset) liability
(202
)
 
370,018

Summary of Income Tax Contingencies
A reconciliation of the beginning and ending amounts of gross unrecognized tax benefits follows:
 
 
 (In thousands)
Balance at
January 1, 2013
$
31,150

Additions based on tax positions related to the current year
1,199

Additions for tax positions of prior years
688

Reductions as a result of lapses in the statute of limitations
(1,248
)
Balance at
December 31, 2013
31,789

Additions based on tax positions related to the current year
2,920

Balance at
December 31, 2014
34,709

Additions for tax positions of the current year
4,168

Balance at
December 31, 2015
$
38,877