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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]  
Schedule of provision for income taxes
The provision for income taxes consists of the following:

 
For the Three Months Ended September 30,
 
For the Nine Months Ended September 30,
 
2012
 
2011
 
2012
 
2011
 
(in thousands)
Current portion of income tax benefit (expense):
 
 
 
 
 
 
 
Federal
$
—

 
$
(20,699
)
 
$
—

 
$
(29,855
)
State
(174
)
 
(637
)
 
(435
)
 
(1,036
)
Deferred portion of income tax benefit (expense)
22,910

 
(112,010
)
 
(7,305
)
 
(164,251
)
Total income tax benefit (expense)
$
22,736

 
$
(133,346
)
 
$
(7,740
)
 
$
(195,142
)
Effective tax rate
37.2
%
 
36.7
%
 
37.5
%
 
36.7
%