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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2014
Income Tax Disclosure [Abstract]  
Reconciliation Of Income Tax Expense [Table Text Block]
A reconciliation of income tax expense, computed by applying the federal statutory rate to pre-tax income to our effective income tax expense is as follows:
 
2014
 
2013
 
2012
 
(In thousands)
Income tax expense computed by applying the statutory rate
$
78,029

 
$
105,514

 
$
13,791

State income tax, net of federal benefit
6,131

 
8,290

 
1,084

Statutory depletion and other
2,503

 
2,919

 
1,351

Income tax expense
$
86,663

 
$
116,723

 
$
16,226

Schedule Of Total Provision For Income Taxes [Table Text Block]

For the periods indicated, the total provision for income taxes consisted of the following:
 
2014
 
2013
 
2012
 
(In thousands)
Current taxes:
 
 
 
 
 
Federal
$
8,594

 
$
15,845

 
$
2,084

State
784

 
146

 
(1,388
)
 
9,378

 
15,991

 
696

Deferred taxes:
 
 
 
 
 
Federal
68,360

 
87,839

 
13,768

State
8,925

 
12,893

 
1,762

 
77,285

 
100,732

 
15,530

Total provision
$
86,663

 
$
116,723

 
$
16,226

Schedule Of Deferred Tax Assets And Liabilities [Table Text Block]
Deferred tax assets and liabilities are comprised of the following at December 31:
 
2014
 
2013
 
(In thousands)
Deferred tax assets:
 
 
 
Allowance for losses and nondeductible accruals
$
55,231

 
$
77,285

Net operating loss carryforward
54,901

 
61,055

Alternative minimum tax and research and development tax credit carryforward
25,991

 
17,258

 
136,123

 
155,598

Deferred tax liability:
 
 
 
Depreciation, depletion, amortization, and impairment
(1,000,811
)
 
(943,411
)
Net deferred tax liability
(864,688
)
 
(787,813
)
Current deferred tax asset
11,527

 
13,585

Non-current—deferred tax liability
$
(876,215
)
 
$
(801,398
)
Schedule of Unrecognized Tax Benefits [Table Text Block]
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
 
2014
 
2013
 
2012
 
(In thousands)
Balance at January 1:
$

 
$

 
$

Additions based on tax positions related to current year
410

 

 

Additions for tax positions of prior years

 

 

Reductions for tax positions of prior years

 

 

Settlements

 

 

Balance at December 31:
$
410

 
$

 
$