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Employee Benefit Plans: (Tables)

6 Months Ended

Jun. 30, 2014

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 Supplemental Executive Retirement Plan ("SERP") for the three and six months ended June 30, 2014 and 2013 are as follows:

		For The Three Months Ended June 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2014				2013				2014				2013				2014				2013
Components of Net Periodic Benefits Cost:
Service cost		$	1,335			$	1,620			$	99			$	106			$	192			$	201
Interest cost		1,845				1,723				130				113				154				129
Expected return on plan assets		(2,235		)		(1,895		)		(113		)		(95		)		—				—
Amortization of transition		—				—				104				105				—				—
Amortization of prior service cost (benefit)		29				30				(50		)		(50		)		40				40
Amortization of actuarial (gain) loss		(7		)		729				(66		)		—				35				85
Net periodic pension cost under accounting standards		967				2,207				104				179				421				455
Regulatory adjustment — deferred		449				(409		)		—				—				—				—
Total expense recognized, before allocation to overhead pool		$	1,416			$	1,798			$	104			$	179			$	421			$	455

		For The Six Months Ended June 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2014				2013				2014				2013				2014				2013
Components of Net Periodic Benefits Cost:
Service cost		$	2,822			$	3,484			$	198			$	212			$	384			$	402
Interest cost		3,760				3,454				260				226				308				258
Expected return on plan assets		(4,450		)		(3,788		)		(226		)		(190		)		—				—
Amortization of transition		—				—				208				210				—				—
Amortization of prior service cost (benefit)		59				60				(100		)		(100		)		80				80
Amortization of actuarial (gain) loss		—				1,440				(132		)		—				70				170
Net periodic pension cost under accounting standards		2,191				4,650				208				358				842				910
Regulatory adjustment — deferred		749				(919		)		—				—				—				—
Total expense recognized, before allocation to overhead pool		$	2,940			$	3,731			$	208			$	358			$	842			$	910

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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=35743120&loc=d3e1928-114920

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