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

12 Months Ended

Dec. 31, 2019

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

Schedule of the changes in accumulated OCI by component

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

	Natural gas cash flow hedges, net of tax				Interest rate cash flow hedges, net of tax				Other postretirement benefits liability adjustment, net of tax				Accumulated OCI (loss), net of tax
	(Thousands)
December 31, 2016	$	9,607			$	(699	)		$	(6,866	)		$	2,042
(Gains) losses reclassified from accumulated OCI, net of tax	(4,982		)	(a)	144			(a)	338			(b)	(4,500		)
December 31, 2017	4,625				(555		)		(6,528		)		(2,458		)
(Gains) losses reclassified from accumulated OCI, net of tax	(4,625		)	(a)	168			(a)	606			(b)	(3,851		)
Distribution to Equitrans Midstream Corporation	—				—				903				903
December 31, 2018	—				(387		)		(5,019		)		(5,406		)
Losses reclassified from accumulated OCI, net of tax	—				387			(a)	316			(b)	703
Change in accounting principle	—				—				(496		)	(c)	(496		)
December 31, 2019	$	—			$	—			$	(5,199	)		$	(5,199	)

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

(b) Noted accumulated OCI reclassification is attributable to the net actuarial loss and net prior service cost related to the Company's other postretirement benefits plan. See Note 1.

(c)

Related to adoption of ASU 2018-02. See Note 1.