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Summary Of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2018 and December 31, 2017 (dollars in thousands):
| March 31, |  | December 31,
| 2018 |  | 2017
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $2,559 and $4,356, respectively (a) | $ | 9,628 |  |  | $ | 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.
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 months ended March 31 (dollars in thousands).
|  | Amounts Reclassified from Accumulated Other Comprehensive Loss |  |
Details about Accumulated Other Comprehensive Loss Components |  | 2018 |  | 2017 |  | Affected Line Item in Statement of Income
Amortization of defined benefit pension items |  |  |  |
Amortization of net prior service cost |  | $ | (228 | ) |  | $ | (299 | ) |  | (a)
Amortization of net loss |  | 2,995 |  |  | 3,638 |  |  | (a)
Adjustment due to effects of regulation |  | (2,508 | ) |  | (3,058 | ) |  | (a)
|  | 259 |  |  | 281 |  |  | Total before tax
|  | (55 | ) |  | (98 | ) |  | Tax expense
|  | $ | 204 |  |  | $ | 183 |  |  | Net of tax
(a) | These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 5 for additional details).
Materials And Supplies Fuel Stock And Natural Gas Stored | Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of March 31, 2018 and December 31, 2017 (dollars in thousands):
| March 31, |  | December 31,
| 2018 |  | 2017
Materials and supplies | $ | 43,202 |  |  | $ | 41,493 |
Fuel stock | 4,798 |  |  | 4,843 |
Stored natural gas | 1,259 |  |  | 11,739 |
Total | $ | 49,259 |  |  | $ | 58,075 |

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