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Employee Benefit Plans: (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2016 and 2015 are as follows:

		For The Three Months Ended June 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2016				2015				2016				2015				2016				2015
Components of Net Periodic Benefits Cost:
Service cost		$	1,316			$	1,452			$	68			$	95			$	200			$	204
Interest cost		2,026				1,905				97				114				186				163
Expected return on plan assets		(2,460		)		(2,452		)		(122		)		(123		)		—				—
Amortization of unrecognized transition (asset)/obligation		—				—				—				—				—				—
Amortization of prior service cost (benefit)		12				30				(9		)		(50		)		6				29
Amortization of actuarial (gain) loss		329				427				(150		)		(53		)		73				108
Net periodic pension cost under accounting standards		1,223				1,362				(116		)		(17		)		465				504
Regulatory adjustment — deferred		64				251				—				—				—				—
Total expense recognized, before allocation to overhead pool		$	1,287			$	1,613			$	(116	)		$	(17	)		$	465			$	504

		For The Six Months Ended June 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2016				2015				2016				2015				2016				2015
Components of Net Periodic Benefits Cost:
Service cost		$	2,548			$	3,138			$	136			$	190			$	400			$	408
Interest cost		3,956				3,844				194				228				372				326
Expected return on plan assets		(4,920		)		(4,898		)		(244		)		(246		)		—				—
Amortization of unrecognized transition (asset)/obligation		—				—				—				—				—				—
Amortization of prior service cost (benefit)		24				60				(18		)		(100		)		12				58
Amortization of actuarial (gain) loss		456				896				(300		)		(106		)		146				216
Net periodic pension cost under accounting standards		2,064				3,040				(232		)		(34		)		930				1,008
Regulatory adjustment — deferred		423				262				—				—				—				—
Total expense recognized, before allocation to overhead pool		$	2,487			$	3,302			$	(232	)		$	(34	)		$	930			$	1,008

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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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