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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2020
Accumulated Other Comprehensive Loss [Abstract] |
Schedule of Accumulated Other Comprehensive Loss, Net of Tax | Accumulated other comprehensive loss, net of tax, consisted of the following as of June 30, 2020 and December 31, 2019 (dollars in thousands):
|  | June 30, 2020 |  |  | December 31, 2019 |
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $2,614 and $2,727, respectively |  | $ | 9,834 |  |  | $ | 10,259 |
Reclassification out of Accumulated Other Comprehensive Income | 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 |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |  | Affected Line Item in Statement of Income
Amortization of defined benefit pension items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net prior service cost |  | $ | (200 | ) |  | $ | (200 | ) |  | $ | (400 | ) |  | $ | (400 | ) |  | (a)
Amortization of net loss |  |  | 3,121 |  |  |  | 3,755 |  |  |  | 6,221 |  |  |  | 7,416 |  |  | (a)
Adjustment due to effects of regulation |  |  | (2,642 | ) |  |  | (3,352 | ) |  |  | (5,283 | ) |  |  | (6,610 | ) |  | (a)
|  |  | 279 |  |  |  | 203 |  |  |  | 538 |  |  |  | 406 |  |  | Total before tax
|  |  | (59 | ) |  |  | (42 | ) |  |  | (113 | ) |  |  | (85 | ) |  | Tax expense
|  | $ | 220 |  |  | $ | 161 |  |  | $ | 425 |  |  | $ | 321 |  |  | 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 information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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