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Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2020

Statement of Comprehensive Income [Abstract]

Reclassification out of Accumulated Other Comprehensive Income

The amounts in parentheses below indicate decreases to net income in the Consolidated Statements of Income for the period, net of tax (in thousands):

			Location on the Consolidated Statements of Income			Amount Reclassified from AOCI
						December 31, 2020			December 31, 2019
Gains and (losses) on cash flow hedges:
Interest rate swaps			Interest expense			$	(2,851)		$	(2,851)
Commodity contracts			Fuel, purchased power and cost of natural gas sold			(601)			417
						(3,452)			(2,434)
Income tax			Income tax benefit (expense)			383			611
Total reclassification adjustments related to cash flow hedges, net of tax						$	(3,069)		$	(1,823)
Amortization of components of defined benefit plans:
Prior service cost			Operations and maintenance			$	103		$	77
Actuarial gain (loss)			Operations and maintenance			(2,387)			(745)
						(2,284)			(668)
Income tax			Income tax benefit (expense)			935			(453)
Total reclassification adjustments related to defined benefit plans, net of tax						$	(1,349)		$	(1,121)
Total reclassifications						$	(4,418)		$	(2,944)

Schedule of Accumulated Other Comprehensive Income (Loss)

Balances by classification included within AOCI, net of tax on the accompanying Consolidated Balance Sheets were as follows (in thousands):

			Derivatives Designated as Cash Flow Hedges
			Interest Rate Swaps			Commodity Derivatives			Employee Benefit Plans			Total
As of December 31, 2019			$	(15,122)		$	(456)		$	(15,077)		$	(30,655)
Other comprehensive income (loss)
before reclassifications			—			(47)			(1,062)			(1,109)
Amounts reclassified from AOCI			2,564			505			1,349			4,418
As of December 31, 2020			$	(12,558)		$	2		$	(14,790)		$	(27,346)
			Derivatives Designated as Cash Flow Hedges
			Interest Rate Swaps			Commodity Derivatives			Employee Benefit Plans			Total
As of December 31, 2018			$	(17,307)		$	328		$	(9,937)		$	(26,916)
Other comprehensive income (loss)
before reclassifications			—			(422)			(6,261)			(6,683)
Amounts reclassified from AOCI			2,185			(362)			1,121			2,944
As of December 31, 2019			$	(15,122)		$	(456)		$	(15,077)		$	(30,655)

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- Definition

Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss).

+ References

No definition available.

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- Definition

Tabular disclosure of the components of accumulated other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900

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