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Employee Benefit Plans: (Tables)

6 Months Ended

Jun. 30, 2013

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, 2013 and 2012 are as follows:

		For The Three Months Ended June 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2013				2012				2013				2012				2013				2012
Components of Net Periodic Benefits Cost:
Service cost		$	1,620			$	1,618			$	106			$	112			$	201			$	183
Interest cost		1,723				1,653				113				136				129				122
Expected return on plan assets		(1,895		)		(1,635		)		(95		)		(90		)		—				—
Amortization of transition		—				—				105				105				—				—
Amortization of prior service cost (benefit)		30				29				(50		)		(50		)		40				40
Amortization of actuarial loss		729				740				—				—				85				77
Net periodic pension cost under accounting standards		2,207				2,405				179				213				455				422
Regulatory adjustment — deferred		(409		)		(632		)		—				—				—				—
Total expense recognized, before allocation to overhead pool		$	1,798			$	1,773			$	179			$	213			$	455			$	422

		For The Six Months Ended June 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2013				2012				2013				2012				2013				2012
Components of Net Periodic Benefits Cost:
Service cost		$	3,484			$	3,337			$	212			$	224			$	402			$	366
Interest cost		3,454				3,329				226				272				258				244
Expected return on plan assets		(3,788		)		(3,271		)		(190		)		(180		)		—				—
Amortization of transition		—				—				210				210				—				—
Amortization of prior service cost (benefit)		60				59				(100		)		(100		)		80				80
Amortization of actuarial loss		1,440				1,518				—				—				170				154
Net periodic pension cost under accounting standards		4,650				4,972				358				426				910				844
Regulatory adjustment — deferred		(919		)		(1,198		)		—				—				—				—
Total expense recognized, before allocation to overhead pool		$	3,731			$	3,774			$	358			$	426			$	910			$	844

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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=21915506&loc=d3e1928-114920

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