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Summary Of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss, net of tax, consisted of the following as of June 30, 2018 and December 31, 2017 (dollars in thousands):
 
June 30,
 
December 31,
 
2018
 
2017
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $2,505 and $4,356, respectively (a)
$
9,424

 
$
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 3 for additional discussion of the adoption of this standard.
Reclassifications Out of Accumulated Other Comprehensive Loss by Component
The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three and six months ended June 30 (dollars in thousands).
 
 
Amounts Reclassified from Accumulated Other Comprehensive Loss
 
 
 
 
Three months ended June 30,
 
Six months ended June 30,
 
 
Details about Accumulated Other Comprehensive Loss Components
 
2018
 
2017
 
2018
 
2017
 
Affected Line Item in Statement of Income
Amortization of defined benefit pension items
 
 
 
 
 
 
 
 
Amortization of net prior service cost
 
$
(228
)
 
$
(299
)
 
$
(456
)
 
$
(598
)
 
(a)
Amortization of net loss
 
2,995

 
3,638

 
$
5,990

 
$
7,276

 
(a)
Adjustment due to effects of regulation
 
(2,509
)
 
(3,057
)
 
(5,017
)
 
(6,115
)
 
(a)
 
 
258

 
282

 
517

 
563

 
Total before tax
 
 
(54
)
 
(99
)
 
(109
)
 
(197
)
 
Tax expense
 
 
$
204

 
$
183

 
$
408

 
$
366

 
Net of tax

(a)
These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 6 for additional details).