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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2018
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
 
2018
 
2017
 
2016
 
Affected Line Item in Statement of Income
Amortization of defined benefit pension items
 
 
 
 
 
 
 
 
Amortization of net prior service cost
 
$
(904
)
 
$
(4,381
)
 
$
(1,171
)
 
(a)
Amortization of net loss
 
(15,554
)
 
36,833

 
(7,602
)
 
(a)
Adjustment due to effects of regulation (b)
 
18,947

 
(33,255
)
 
7,360

 
(a)
 
 
2,489

 
(803
)
 
(1,413
)
 
Total before tax
 
 
(523
)
 
281

 
495

 
Tax benefit (expense)
 
 
$
1,966

 
$
(522
)
 
$
(918
)
 
Net of tax
(a)
These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 10 for additional details).
(b)
The adjustment for the effects of regulation during the year ended December 31, 2016 includes approximately $2.1 million related to the reclassification of a pension regulatory asset associated with one of our jurisdictions into accumulated other comprehensive loss.
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):
 
2018
 
2017
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $2,091 and $4,356, respectively (a)
$
7,866

 
$
8,090

(a)
Effective January 1, 2018, the Company adopted ASU No. 2018-02. As a result of the adoption of this new standard, $1.7 million in excess tax benefits was reclassified from accumulated other comprehensive loss to retained earnings. See Note 2 for additional discussion of the adoption of this standard.