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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The following table reconciles our effective income tax rate to the federal statutory rate:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2013
 
2012
 
2013
 
2012
 
Federal statutory rate
35.0
 %
 
35.0
%
 
35.0
 %
 
35.0
 %
 
Flow-through repairs deductions
(17.7
)
 
14.6

 
(16.8
)
 
(22.9
)
 
Flow-through of state bonus depreciation deduction
(4.5
)
 
2.2

 
(4.3
)
 
(5.2
)
 
Production tax credits
(2.8
)
 
—

 
(2.8
)
 
—

 
Prior year permanent return to accrual adjustments
—

 
15.0

 
0.6

 
(4.5
)
 
Recognition of state net operating loss benefit / valuation allowance release
—

 
0.4

 
—

 
(0.1
)
 
State income tax and other, net
0.4

 
2.3

 
—

 
2.5

 
 
10.4
 %
 
69.5
%
 
11.7
 %
 
4.8
 %
 

The following table summarizes the significant differences in income tax expense based on the differences between our effective tax rate and the federal statutory rate (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
Income (Loss) Before Income Taxes
$
17,462

 
$
(12,360
)
 
$
76,855

 
$
41,698

 
 
 
 
 
 
 
 
Income tax calculated at 35% federal statutory rate
6,112

 
(4,326
)
 
26,899

 
14,594

 
 
 
 
 
 
 
 
Permanent or flow through adjustments:
 
 
 
 
 
 
 
Flow-through repairs deductions
(3,086
)
 
(1,808
)
 
(12,898
)
 
(9,547
)
Flow-through of state bonus depreciation deduction
(786
)
 
(276
)
 
(3,287
)
 
(2,159
)
Production tax credits
(482
)
 
—

 
(2,152
)
 
—

Prior year permanent return to accrual adjustments
—

 
(1,857
)
 
541

 
(1,857
)
Recognition of state net operating loss benefit / valuation allowance release
—

 
(51
)
 
—

 
(51
)
State income tax and other, net
57

 
(270
)
 
(138
)
 
1,009

 
$
(4,297
)
 
$
(4,262
)
 
$
(17,934
)
 
$
(12,605
)
 
 
 
 
 
 
 
 
Income tax expense (benefit)
$
1,815

 
$
(8,588
)
 
$
8,965

 
$
1,989