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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2019
Accumulated Other Comprehensive Loss [Abstract]  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table details the reclassifications out of accumulated other comprehensive loss by component for the years ended December 31 (dollars in thousands):
 
 
Amounts Reclassified from Accumulated Other Comprehensive Loss
 
 
Details about Accumulated Other Comprehensive Loss Components
 
2019
 
2018
 
2017
 
Affected Line Item in Statement of Income
Amortization of defined benefit pension items
 
 
 
 
 
 
 
 
Amortization of net prior service cost
 
$
(794
)
 
$
(904
)
 
$
(4,381
)
 
(a)
Amortization of net loss
 
17,074

 
(15,554
)
 
36,833

 
(a)
Adjustment due to effects of regulation
 
(19,309
)
 
18,947

 
(33,255
)
 
(a)
 
 
(3,029
)
 
2,489

 
(803
)
 
Total before tax
 
 
636

 
(523
)
 
281

 
Tax benefit (expense)
 
 
$
(2,393
)
 
$
1,966

 
$
(522
)
 
Net of tax
(a)
These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 11 for additional details).
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated other comprehensive loss, net of tax, consisted of the following as of December 31 (dollars in thousands):
 
2019
 
2018
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $2,727 and $2,091, respectively
$
10,259

 
$
7,866