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Employee Benefit Plans: (Tables)

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [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, 2016 and 2015 are as follows:

		For The Three Months Ended September 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2016				2015				2016				2015				2016				2015
Components of Net Periodic Benefits Cost:
Service cost		$	1,274			$	1,569			$	68			$	65			$	200			$	204
Interest cost		1,978				1,922				97				99				186				163
Expected return on plan assets		(2,457		)		(2,449		)		(122		)		(123		)		—				—
Amortization of prior service cost (benefit)		12				30				(9		)		(50		)		6				29
Amortization of actuarial (gain) loss		228				448				(150		)		(131		)		73				108
Net periodic pension cost under accounting standards		1,035				1,520				(116		)		(140		)		465				504
Regulatory adjustment — deferred		221				130				—				—				—				—
Total expense recognized, before allocation to overhead pool		$	1,256			$	1,650			$	(116	)		$	(140	)		$	465			$	504

		For The Nine Months Ended September 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2016				2015				2016				2015				2016				2015
Components of Net Periodic Benefits Cost:
Service cost		$	3,822			$	4,707			$	204			$	255			$	600			$	612
Interest cost		5,934				5,766				291				327				558				489
Expected return on plan assets		(7,377		)		(7,347		)		(366		)		(369		)		—				—
Amortization of prior service cost (benefit)		36				90				(27		)		(150		)		18				87
Amortization of actuarial (gain) loss		684				1,344				(450		)		(237		)		219				324
Net periodic pension cost under accounting standards		3,099				4,560				(348		)		(174		)		1,395				1,512
Regulatory adjustment — deferred		644				392				—				—				—				—
Total expense recognized, before allocation to overhead pool		$	3,743			$	4,952			$	(348	)		$	(174	)		$	1,395			$	1,512

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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=58740216&loc=d3e1928-114920

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