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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The following table summarizes the differences between our effective tax rate and the federal statutory rate (in thousands):
 
Three Months Ended March 31,
 
2020
 
2019
Income Before Income Taxes
$
48,898

 
 
 
$
74,379

 
 
 
 
 
 
 
 
 
 
Income tax calculated at federal statutory rate
10,268

 
21.0
 %
 
15,620

 
21.0
 %
 
 
 
 
 
 
 
 
Permanent or flow-through adjustments:
 
 
 
 
 
 
 
State income tax, net of federal provisions
22

 
—

 
928

 
1.2

Flow-through repairs deductions
(7,438
)
 
(15.2
)
 
(7,935
)
 
(10.7
)
Production tax credits
(3,611
)
 
(7.4
)
 
(4,432
)
 
(6.0
)
Share-based compensation
(609
)
 
(1.2
)
 
186

 
0.3

Amortization of excess deferred income tax
(356
)
 
(0.7
)
 
(1,376
)
 
(1.8
)
Plant and depreciation of flow-through items
137

 
0.3

 
(1,523
)
 
(2.0
)
Recognition of unrecognized tax benefit
—

 
—

 
376

 
0.5

Other, net
(219
)
 
(0.5
)
 
(271
)
 
(0.4
)
 
(12,074
)
 
(24.7
)
 
(14,047
)
 
(18.9
)
 
 
 
 
 
 
 
 
Income tax (benefit) expense
$
(1,806
)
 
(3.7
)%
 
$
1,573

 
2.1
 %