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Summary Of Significant Accounting Policies (Tables) | 6 Months Ended
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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).

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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