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Employee Benefit Plans: (Tables)

6 Months Ended

Jun. 30, 2021

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 for Registrant’s pension plan, postretirement medical benefit plan and SERP for the three and six months ended June 30, 2021 and 2020 were as follows:

						For The Three Months Ended June 30,
						Pension Benefits												Other Postretirement Benefits												SERP
(dollars in thousands)						2021						2020						2021						2020						2021						2020
Components of Net Periodic Benefits Cost:
Service cost						$	1,625					$	1,372					$	40					$	47					$	348					$	244
Interest cost						1,712						1,986						31						56						229						247
Expected return on plan assets						(3,134)						(2,950)						(134)						(127)						—						—
Amortization of prior service cost						109						109						—						—						—						—
Amortization of actuarial (gain) loss						993						526						(287)						(199)						419						211
Net periodic benefits costs under accounting standards						1,305						1,043						(350)						(223)						996						702
Regulatory adjustment - deferred						(351)						(148)						—						—						—						—
Total expense (benefit) recognized, before surcharges and allocation to overhead pool						$	954					$	895					$	(350)					$	(223)					$	996					$	702
						For The Six Months Ended June 30,
						Pension Benefits												Other Postretirement Benefits												SERP
(dollars in thousands)						2021						2020						2021						2020						2021						2020
Components of Net Periodic Benefits Cost:
Service cost						$	3,250					$	2,780					$	80					$	94					$	696					$	488
Interest cost						3,424						3,940						62						112						458						494
Expected return on plan assets						(6,268)						(5,900)						(268)						(254)						—						—
Amortization of prior service cost						218						218						—						—						—						—
Amortization of actuarial (gain) loss						1,986						968						(574)						(398)						838						422
Net periodic benefits costs under accounting standards						2,610						2,006						(700)						(446)						1,992						1,404
Regulatory adjustment - deferred						(702)						(241)						—						—						—						—
Total expense (benefit) recognized, before surcharges and allocation to overhead pool						$	1,908					$	1,765					$	(700)					$	(446)					$	1,992					$	1,404

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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