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Employee Benefit Plans: (Tables)

9 Months Ended

Sep. 30, 2017

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, before allocation to the overhead pool, for Registrant’s pension plan, postretirement plan and SERP for the three and nine months ended September 30, 2017 and 2016 are as follows:

		For The Three Months Ended September 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2017				2016				2017				2016				2017				2016
Components of Net Periodic Benefits Cost:
Service cost		$	1,250			$	1,274			$	53			$	68			$	232			$	200
Interest cost		1,976				1,978				73				97				223				186
Expected return on plan assets		(2,428		)		(2,457		)		(107		)		(122		)		—				—
Amortization of prior service cost (benefit)		—				12				—				(9		)		3				6
Amortization of actuarial (gain) loss		231				228				(242		)		(150		)		194				73
Net periodic pension cost under accounting standards		1,029				1,035				(223		)		(116		)		652				465
Regulatory adjustment — deferred		266				221				—				—				—				—
Total expense recognized, before surcharges and allocation to overhead pool		$	1,295			$	1,256			$	(223	)		$	(116	)		$	652			$	465

		For The Nine Months Ended September 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2017				2016				2017				2016				2017				2016
Components of Net Periodic Benefits Cost:
Service cost		$	3,750			$	3,822			$	171			$	204			$	696			$	600
Interest cost		5,928				5,934				243				291				669				558
Expected return on plan assets		(7,278		)		(7,377		)		(351		)		(366		)		—				—
Amortization of prior service cost (benefit)		—				36				—				(27		)		9				18
Amortization of actuarial (gain) loss		693				684				(582		)		(450		)		582				219
Net periodic pension cost under accounting standards		3,093				3,099				(519		)		(348		)		1,956				1,395
Regulatory adjustment — deferred		791				644				—				—				—				—
Total expense recognized, before surcharges and allocation to overhead pool		$	3,884			$	3,743			$	(519	)		$	(348	)		$	1,956			$	1,395

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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