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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
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 June 30,
 
2019
 
2018
Income Before Income Taxes
$
25,436

 
 
 
$
46,889

 
 
 
 
 
 
 
 
 
 
Income tax calculated at federal statutory rate
5,341

 
21.0
 %
 
9,846

 
21.0
 %
 
 
 
 
 
 
 
 
Permanent or flow-through adjustments:
 
 
 
 
 
 
 
State income, net of federal provisions
237

 
0.9

 
801

 
1.7

Release of unrecognized tax benefit
(23,201
)
 
(91.2
)
 
—

 
—

Flow-through repairs deductions
(2,153
)
 
(8.5
)
 
(4,095
)
 
(8.7
)
Production tax credits
(1,406
)
 
(5.5
)
 
(2,559
)
 
(5.5
)
Plant and depreciation of flow-through items
(663
)
 
(2.6
)
 
(571
)
 
(1.2
)
Amortization of excess deferred income tax
(189
)
 
(0.7
)
 
—

 
—

Other, net
(192
)
 
(0.8
)
 
(320
)
 
(0.7
)
 
(27,567
)
 
(108.4
)
 
(6,744
)
 
(14.4
)
 
 
 
 
 
 
 
 
Income tax (benefit) expense
$
(22,226
)
 
(87.4
)%
 
$
3,102

 
6.6
 %


 
Six Months Ended June 30,
 
2019
 
2018
Income Before Income Taxes
$
99,815

 
 
 
$
107,302

 
 
 
 
 
 
 
 
 
 
Income tax calculated at federal statutory rate
20,961

 
21.0
 %
 
22,533

 
21.0
 %
 
 
 
 
 
 
 
 
Permanent or flow through adjustments:
 
 
 
 
 
 
 
State income, net of federal provisions
1,165

 
1.2

 
1,533

 
1.5

Release of unrecognized tax benefit
(22,825
)
 
(22.9
)
 
—

 
—

Flow-through repairs deductions
(10,088
)
 
(10.1
)
 
(10,681
)
 
(10.0
)
Production tax credits
(5,838
)
 
(5.8
)
 
(6,447
)
 
(6.0
)
Plant and depreciation of flow through items
(2,186
)
 
(2.2
)
 
(1,487
)
 
(1.4
)
Amortization of excess deferred income tax
(1,565
)
 
(1.6
)
 
(384
)
 
(0.4
)
Share-based compensation
186

 
0.2

 
275

 
0.3

Other, net
(463
)
 
(0.5
)
 
(326
)
 
(0.3
)
 
(41,614
)
 
(41.7
)
 
(17,517
)
 
(16.3
)
 
 
 
 
 
 
 
 
Income tax (benefit) expense
$
(20,653
)
 
(20.7
)%
 
$
5,016

 
4.7
 %