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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]  
Schedule of reconciliation of statutory federal income tax expense to income from continuing operations before income taxes and the actual income tax expense
A reconciliation of the statutory federal income tax benefit at 35% to the actual income tax benefit is as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
Federal statutory income tax benefit
$
(210,482
)
 
$
(45,265
)
 
$
(372,306
)
 
$
(1,010,217
)
Increases (reductions) in taxes due to:
 
 
 
 
 
 
 
Percentage depletion allowance
(7,062
)
 
(28,255
)
 
(27,909
)
 
(61,157
)
State taxes, net of federal tax impact
(9,151
)
 
(10,760
)
 
(19,190
)
 
(32,490
)
State statutory tax rate change, net of federal tax impact
(2,524
)
 
—

 
(2,524
)
 
(6,397
)
Non-deductible fines and penalties
1,253

 
1,085

 
12,472

 
2,909

Non-deductible goodwill impairment
88,585

 
—

 
88,585

 
506,634

Change in valuation allowance
(5,070
)
 
(2,048
)
 
2,614

 
20,706

Other, net
1,314

 
2,061

 
9,236

 
3,247

Income tax benefit
$
(143,137
)
 
$
(83,182
)
 
$
(309,022
)
 
$
(576,765
)