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Employee Benefit Plans: (Tables)

9 Months Ended

Sep. 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 nine months ended September 30, 2014 and 2013 are as follows:

		For The Three Months Ended September 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2014				2013				2014				2013				2014				2013
Components of Net Periodic Benefits Cost:
Service cost		$	1,411			$	1,742			$	63			$	106			$	192			$	201
Interest cost		1,880				1,727				111				113				154				129
Expected return on plan assets		(2,225		)		(1,894		)		(114		)		(95		)		—				—
Amortization of transition		—				—				105				105				—				—
Amortization of prior service cost (benefit)		30				30				(50		)		(50		)		40				40
Amortization of actuarial (gain) loss		—				720				(115		)		—				35				85
Net periodic pension cost under accounting standards		1,096				2,325				—				179				421				455
Regulatory adjustment — deferred		374				(521		)		—				—				—				—
Total expense recognized, before allocation to overhead pool		$	1,470			$	1,804			$	—			$	179			$	421			$	455

		For The Nine Months Ended September 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2014				2013				2014				2013				2014				2013
Components of Net Periodic Benefits Cost:
Service cost		$	4,233			$	5,226			$	261			$	318			$	576			$	603
Interest cost		5,640				5,181				371				339				462				387
Expected return on plan assets		(6,675		)		(5,682		)		(340		)		(285		)		—				—
Amortization of transition		—				—				313				315				—				—
Amortization of prior service cost (benefit)		89				90				(150		)		(150		)		120				120
Amortization of actuarial (gain) loss		—				2,160				(247		)		—				105				255
Net periodic pension cost under accounting standards		3,287				6,975				208				537				1,263				1,365
Regulatory adjustment — deferred		1,123				(1,440		)		—				—				—				—
Total expense recognized, before allocation to overhead pool		$	4,410			$	5,535			$	208			$	537			$	1,263			$	1,365

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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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