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Employee Benefit Plans: (Tables)

6 Months Ended

Jun. 30, 2019

Retirement Benefits [Abstract]

Schedule of components of net periodic benefit costs, before allocation to the overhead pool, for Registrant's pension plan, postretirement plan, and SERP

The components of net periodic benefit costs for Registrant’s pension plan, postretirement plan and SERP for the three and six months ended June 30, 2019 and 2018 were as follows:

		For The Three Months Ended June 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2019				2018				2019				2018				2019				2018
Components of Net Periodic Benefits Cost:
Service cost		$	986			$	1,269			$	53			$	57			$	298			$	274
Interest cost		2,133				1,903				80				72				267				222
Expected return on plan assets		(2,595		)		(2,795		)		(112		)		(123		)		—				—
Amortization of prior service cost		109				—				—				—				—				—
Amortization of actuarial (gain) loss		351				283				(150		)		(182		)		118				262
Net periodic benefits costs under accounting standards		984				660				(129		)		(176		)		683				758
Regulatory adjustment - deferred		(342		)		—				—				—				—				—
Total expense recognized, before surcharges and allocation to overhead pool		$	642			$	660			$	(129	)		$	(176	)		$	683			$	758

		For The Six Months Ended June 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2019				2018				2019				2018				2019				2018
Components of Net Periodic Benefits Cost:
Service cost		$	2,220			$	2,670			$	106			$	114			$	596			$	548
Interest cost		4,264				3,824				160				144				534				444
Expected return on plan assets		(5,188		)		(5,586		)		(224		)		(246		)		—				—
Amortization of prior service cost		218				—				—				—				—				—
Amortization of actuarial (gain) loss		710				628				(300		)		(364		)		236				524
Net periodic benefits costs under accounting standards		2,224				1,536				(258		)		(352		)		1,366				1,516
Regulatory adjustment - deferred		(342		)		—				—				—				—				—
Total expense recognized, before surcharges and allocation to overhead pool		$	1,882			$	1,536			$	(258	)		$	(352	)		$	1,366			$	1,516

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- References

No definition available.

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- Definition

Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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