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Employee Benefit Plans: (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2017 and 2016 are as follows:

		For The Three Months Ended June 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2017				2016				2017				2016				2017				2016
Components of Net Periodic Benefits Cost:
Service cost		$	1,249			$	1,316			$	59			$	68			$	232			$	200
Interest cost		1,985				2,026				85				97				223				186
Expected return on plan assets		(2,240		)		(2,460		)		(122		)		(122		)		—				—
Amortization of prior service cost (benefit)		—				12				—				(9		)		3				6
Amortization of actuarial (gain) loss		253				329				(170		)		(150		)		194				73
Net periodic pension cost under accounting standards		1,247				1,223				(148		)		(116		)		652				465
Regulatory adjustment — deferred		92				64				—				—				—				—
Total expense recognized, before surcharges and allocation to overhead pool		$	1,339			$	1,287			$	(148	)		$	(116	)		$	652			$	465

		For The Six Months Ended June 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2017				2016				2017				2016				2017				2016
Components of Net Periodic Benefits Cost:
Service cost		$	2,500			$	2,548			$	118			$	136			$	464			$	400
Interest cost		3,952				3,956				170				194				446				372
Expected return on plan assets		(4,850		)		(4,920		)		(244		)		(244		)		—				—
Amortization of prior service cost (benefit)		—				24				—				(18		)		6				12
Amortization of actuarial (gain) loss		462				456				(340		)		(300		)		388				146
Net periodic pension cost under accounting standards		2,064				2,064				(296		)		(232		)		1,304				930
Regulatory adjustment — deferred		525				423				—				—				—				—
Total expense recognized, before surcharges and allocation to overhead pool		$	2,589			$	2,487			$	(296	)		$	(232	)		$	1,304			$	930

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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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