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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of the Company's consolidated federal statutory and effective income tax on income from continuing operations is as follows (in thousands):
 
THREE MONTHS ENDED
 
NINE MONTHS ENDED
 
SEPTEMBER 30
 
SEPTEMBER 30
 
2013
 
2012
 
2013
 
2012
Income from continuing operations before income tax provision:
$
15,484

 
$
13,675

 
$
28,564

 
$
25,255

Statutory taxes at 35%
$
5,419

 
$
4,786

 
$
9,997

 
$
8,839

Discrete items:
 
 
 
 
 
 
 
Other
(727
)
 
(344
)
 
(729
)
 
(323
)
 
(727
)
 
(344
)
 
(729
)
 
(323
)
Other permanent items:
 

 
 

 
 

 
 

NACoal percentage depletion
(1,728
)
 
(1,462
)
 
(3,025
)
 
(2,411
)
Other
195

 
319

 
427

 
619

 
(1,533
)
 
(1,143
)
 
(2,598
)
 
(1,792
)
Income tax provision
$
3,159

 
$
3,299

 
$
6,670

 
$
6,724

Effective income tax rate
20.4
%
 
24.1
%
 
23.4
%
 
26.6
%