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Income Taxes Income Taxes (Notes)
 3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block]
INCOME TAXES
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):
 
2019
 
2018
Federal income taxes at statutory rates
$
30,639

21.0
 %
 
$
13,790

21.0
 %
Increase (decrease) in tax resulting from:
 
 
 
 
 
Tax effect of regulatory treatment of utility plant differences
(2,080
)
(1.4
)
 
(1,018
)
(1.6
)
State income tax expense
1,659

1.1

 
964

1.5

Acquisition costs
(1,824
)
(1.2
)
 
46

0.1

Settlement of equity awards
612

0.4

 
(990
)
(1.5
)
Other
1,011

0.7

 
(2,082
)
(3.2
)
Total income tax expense
$
30,017

20.6
 %
 
$
10,710

16.3
 %