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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 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
 
MARCH 31
 
2013
 
2012
Income from continuing operations before income tax provision:
$
5,837

 
$
6,750

Statutory taxes at 35%
$
2,043

 
$
2,363

Discrete items:
 
 
 
Other
(142
)
 
11

 
(142
)
 
11

Other permanent items:
 
 
 

NACoal percentage depletion
(586
)
 
(603
)
Foreign tax rate differential
(24
)
 
(21
)
Other
124

 
288

 
(486
)
 
(336
)
Income tax provision
$
1,415

 
$
2,038

Effective income tax rate
24.2
%
 
30.2
%