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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2019
Accumulated Other Comprehensive Loss [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated other comprehensive loss, net of tax, consisted of the following as of September 30, 2019 and December 31, 2018 (dollars in thousands):
 
September 30,
 
December 31,
 
2019
 
2018
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $1,963 and $2,091, respectively
$
7,383

 
$
7,866
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three and nine months ended September 30 (dollars in thousands).
 
 
Amounts Reclassified from Accumulated Other Comprehensive Loss
 
 
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
Details about Accumulated Other Comprehensive Loss Components
 
2019
 
2018
 
2019
 
2018
 
Affected Line Item in Statement of Income
Amortization of defined benefit pension items
 
 
 
 
 
 
 
 
Amortization of net prior service cost
 
$
(200
)
 
$
(228
)
 
$
(600
)
 
$
(684
)
 
(a)
Amortization of net loss
 
3,852

 
2,962

 
11,268

 
8,952

 
(a)
Adjustment due to effects of regulation
 
(3,447
)
 
(2,476
)
 
(10,057
)
 
(7,493
)
 
(a)
 
 
205

 
258

 
611

 
775

 
Total before tax
 
 
(43
)
 
(54
)
 
(128
)
 
(163
)
 
Tax expense
 
 
$
162

 
$
204

 
$
483

 
$
612

 
Net of tax
(a)
These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 7 for additional details).