Summary Of Significant Accounting Policies (Tables)

3 Months Ended

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