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INCOME TAXES (Tables)
 9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]  
Reconciliation between the effective income tax rate, as computed on income (loss) before income taxes, and the statutory federal income tax rate
Reconciliation between the effective income tax rate, as computed on income before income taxes, and the statutory federal income tax rate for the three and nine months ended September 30, 2013 and 2012, is presented in the following table:
 

Three Months Ended 
 September 30
 
Nine Months Ended 
 September 30
 
2013

2012

2013

2012
 
(in thousands)
Income tax provision (benefit) at the statutory
federal rate
$
7,351

 
35.0
 %
 
$
4,122

 
35.0
 %
 
$
1,948

 
35.0
 %
 
$
(1,637
)
 
(35.0
)%
Federal income tax effects of:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Net reversal in valuation allowances
(550
)
 
(2.6
)
 
(396
)
 
(3.4
)
 
(766
)
 
(13.8
)
 
(3,729
)
 
(79.7
)
Alternative fuel tax credit
(288
)
 
(1.4
)
 
—

 
—

 
(1,708
)
 
(30.7
)
 
—

 
—

Effect of permanent differences and other
(247
)
 
(1.2
)
 
1,121

 
9.5

 
473

 
8.5

 
250

 
5.3

State income taxes
756

 
3.6

 
411

 
3.5

 
154

 
2.8

 
243

 
5.2

Total income tax provision (benefit)
$
7,022

 
33.4
 %
 
$
5,258

 
44.6
 %
 
$
101

 
1.8
 %
 
$
(4,873
)
 
(104.2
)%