XML 35 R22.htm IDEA: XBRL DOCUMENT v3.10.0.1

Employee Benefit Plans: (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [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 the supplemental executive retirement plan ("SERP") for the three and nine months ended September 30, 2018 and 2017 are as follows:

		For The Three Months Ended September 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2018				2017				2018				2017				2018				2017
Components of Net Periodic Benefits Cost:
Service cost		$	1,335			$	1,250			$	48			$	53			$	274			$	232
Interest cost		1,912				1,976				75				73				222				223
Expected return on plan assets		(2,793		)		(2,428		)		(123		)		(107		)		—				—
Amortization of prior service cost (benefit)		—				—				—				—				—				3
Amortization of actuarial (gain) loss		314				231				(212		)		(242		)		262				194
Net periodic pension cost under accounting standards		768				1,029				(212		)		(223		)		758				652
Regulatory adjustment — deferred		—				266				—				—				—				—
Total expense recognized, before surcharges and allocation to overhead pool		$	768			$	1,295			$	(212	)		$	(223	)		$	758			$	652

		For The Nine Months Ended September 30,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2018				2017				2018				2017				2018				2017
Components of Net Periodic Benefits Cost:
Service cost		$	4,005			$	3,750			$	162			$	171			$	822			$	696
Interest cost		5,736				5,928				219				243				666				669
Expected return on plan assets		(8,379		)		(7,278		)		(369		)		(351		)		—				—
Amortization of prior service cost (benefit)		—				—				—				—				—				9
Amortization of actuarial (gain) loss		942				693				(576		)		(582		)		786				582
Net periodic pension cost under accounting standards		2,304				3,093				(564		)		(519		)		2,274				1,956
Regulatory adjustment — deferred		—				791				—				—				—				—
Total expense recognized, before surcharges and allocation to overhead pool		$	2,304			$	3,884			$	(564	)		$	(519	)		$	2,274			$	1,956

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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=82843861&loc=d3e1928-114920

+ Details

Name:	us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration