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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The following table summarizes the significant differences from the federal statutory rate (in thousands):

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2012
 
2011
 
2012
 
2011
(Loss) Income Before Income Taxes
$
(12,360
)
 
$
15,530

 
$
41,698

 
$
67,737


 
 
 
 
 
 
 
Income tax calculated at 35% federal statutory rate
4,326

 
(5,435
)
 
(14,594
)
 
(23,707
)

 
 
 
 
 
 
 
Permanent or flow through adjustments:
 
 
 
 
 
 
 
Prior year permanent return to accrual adjustments
1,857

 
—

 
1,857

 
(2,571
)
Flow-through repairs deductions
1,808

 
3,243

 
9,547

 
8,745

Flow-through of state bonus depreciation deduction
276

 
1,170

 
2,159

 
4,452

Recognition of state net operating loss benefit/valuation allowance release
51

 
—

 
51

 
2,402

State income tax and other, net
270

 
387

 
(1,009
)
 
1,382


$
4,262

 
$
4,800

 
$
12,605

 
$
14,410


 
 
 
 
 
 
 
Income tax benefit (expense)
$
8,588

 
$
(635
)
 
$
(1,989
)
 
$
(9,297
)