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Income Taxes 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 significant factors impacting the difference between our effective tax rate and the federal statutory rate for the three months ended March 31 (dollars in thousands):
 
2020
 
2019
Federal income taxes at statutory rates
$
11,961

21.0
 %
 
$
30,639

21.0
 %
Increase (decrease) in tax resulting from:
 
 
 
 
 
Tax effect of regulatory treatment of utility plant differences
(2,402
)
(4.2
)
 
(2,080
)
(1.4
)
State income tax expense
1,227

2.1

 
1,659

1.1

Acquisition costs
—

—

 
(1,824
)
(1.2
)
Settlement of equity awards
165

0.3

 
612

0.4

Other
(2,419
)
(4.2
)
 
1,011

0.7

Total income tax expense
$
8,532

15.0
 %
 
$
30,017

20.6
 %