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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Abstract]  
Schedule of provision for income taxes
The provision for income taxes consists of the following:

 
For the Three Months Ended March 31,
 
2013
 
2012
 
(in thousands)
Current portion of income tax expense:
 
 
 
Federal
$

 
$

State
102

 
393

Deferred portion of income tax expense
10,280

 
15,288

Total income tax expense
$
10,382

 
$
15,681

Effective tax rate
38.3
%
 
37.3
%