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Summary Of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2017
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, 2017 and December 31, 2016 (dollars in thousands):
| June 30, |  | December 31,
| 2017 |  | 2016
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $3,878 and $4,075, respectively | $ | 7,202 |  |  | $ | 7,568 |
Reclassifications Out of Accumulated Other Comprehensive Loss by Component | The following table details the reclassifications out of accumulated other comprehensive loss 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 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | Affected Line Item in Statement of Income
Amortization of defined benefit pension items |  |  |  |  |  |  |  |
Amortization of net prior service cost |  | $ | (299 | ) |  | $ | (311 | ) |  | $ | (598 | ) |  | $ | (622 | ) |  | (a)
Amortization of net loss |  | 3,638 |  |  | 3,642 |  |  | $ | 7,276 |  |  | $ | 7,284 |  |  | (a)
Adjustment due to effects of regulation |  | (3,057 | ) |  | (3,115 | ) |  | (6,115 | ) |  | (8,338 | ) |  | (a) (b)
|  | 282 |  |  | 216 |  |  | 563 |  |  | (1,676 | ) |  | Total before tax
|  | (99 | ) |  | (76 | ) |  | (197 | ) |  | 587 |  |  | Tax benefit (expense)
|  | $ | 183 |  |  | $ | 140 |  |  | $ | 366 |  |  | $ | (1,089 | ) |  | Net of tax
(a) | These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 4 for additional details).
Utility Taxes | Utility related taxes collected from customers (primarily state excise taxes and city utility taxes) are recorded as operating revenue and expense. Taxes other than income taxes consisted of the following items for the three and six months ended June 30 (dollars in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Utility related taxes | $ | 13,552 |  |  | $ | 12,573 |  |  | $ | 35,136 |  |  | $ | 30,938 |
Property taxes | 9,432 |  |  | 9,290 |  |  | 19,838 |  |  | 19,710 |
Other taxes | 818 |  |  | 752 |  |  | 1,490 |  |  | 1,352 |
Total | $ | 23,802 |  |  | $ | 22,615 |  |  | $ | 56,464 |  |  | $ | 52,000 |
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 net realizable value for our non-regulated operations and consisted of the following as of June 30, 2017 and December 31, 2016 (dollars in thousands):
| June 30, |  | December 31,
| 2017 |  | 2016
Materials and supplies | $ | 41,492 |  |  | $ | 40,700 |
Fuel stock | 5,921 |  |  | 4,585 |
Stored natural gas | 13,774 |  |  | 8,029 |
Total | $ | 61,187 |  |  | $ | 53,314 |

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