Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2020

Statement of Comprehensive Income [Abstract]

Reclassification Out of Accumulated Other Comprehensive Income (Loss)

The following table details reclassifications out of AOCI and into net income. The amounts in parentheses below indicate decreases to net income in the Condensed Consolidated Statements of Income for the period (in thousands):

	Location on the Condensed Consolidated Statements of Income	Amount Reclassified from AOCI
		Three Months Ended June 30,				Six Months Ended June 30,
		2020		2019		2020		2019
Gains and (losses) on cash flow hedges:
Interest rate swaps	Interest expense	$	(713)	$	(713)	$	(1,426)	$	(1,426)
Commodity contracts	Fuel, purchased power and cost of natural gas sold	(70)		83		(556)		637
		(783)		(630)		(1,982)		(789)
Income tax	Income tax benefit (expense)	186		153		471		188
Total reclassification adjustments related to cash flow hedges, net of tax		$	(597)	$	(477)	$	(1,511)	$	(601)
Amortization of components of defined benefit plans:
Prior service cost	Operations and maintenance	$	25	$	20	$	55	$	39
Actuarial gain (loss)	Operations and maintenance	(597)		(221)		(1,194)		(441)
		(572)		(201)		(1,139)		(402)
Income tax	Income tax benefit (expense)	176		47		264		95
Total reclassification adjustments related to defined benefit plans, net of tax		$	(396)	$	(154)	$	(875)	$	(307)
Total reclassifications		$	(993)	$	(631)	$	(2,386)	$	(908)

Schedule of Accumulated Other Comprehensive Income (Loss)

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

	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	—		(220)		55		(165)
Amounts reclassified from AOCI	1,087		424		875		2,386
As of June 30, 2020	$	(14,035)	$	(252)	$	(14,147)	$	(28,434)
	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	—		(219)		—		(219)
Amounts reclassified from AOCI	1,091		(490)		307		908
As of June 30, 2019	$	(16,216)	$	(381)	$	(9,630)	$	(26,227)