Changes in Accumulated OCI (Loss) by Component (Tables)

9 Months Ended

Sep. 30, 2020

Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]

Schedule of Changes in Accumulated OCI by Component

The following table summarizes the changes in accumulated OCI (loss) by component.

	Interest rate cash flow hedges, net of tax			Other postretirement benefits liability adjustment, net of tax			Accumulated OCI (loss), net of tax
	(Thousands)
July 1, 2019	$	(303)		$	(5,363)		$	(5,666)
Losses reclassified from accumulated OCI, net of tax	43		(a)	77		(b)	120
September 30, 2019	$	(260)		$	(5,286)		$	(5,546)
July 1, 2020	$	—		$	(5,115)		$	(5,115)
Losses reclassified from accumulated OCI, net of tax	—			72		(b)	72
September 30, 2020	$	—		$	(5,043)		$	(5,043)
January 1, 2019	$	(387)		$	(5,019)		$	(5,406)
Losses reclassified from accumulated OCI, net of tax	127		(a)	229		(b)	356
Change in accounting principle	—			(496)		(c)	(496)
September 30, 2019	$	(260)		$	(5,286)		$	(5,546)
January 1, 2020	$	—		$	(5,199)		$	(5,199)
Losses reclassified from accumulated OCI, net of tax	—			156		(b)	156
September 30, 2020	$	—		$	(5,043)		$	(5,043)

(a)Losses, net of tax, related to interest rate cash flow hedges were reclassified from accumulated OCI into interest expense.

(b)Losses, net of tax, related to other postretirement benefits liability adjustments are attributable to net actuarial losses and net prior service costs.

(c)Related to adoption of ASU 2018-02.