Debt

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

The following table provides an estimate of the fair value of NW Holdings' long-term debt, including current maturities of long-term debt, using market prices in effect on the valuation date:

	NW Holdings
	June 30,				December 31,
In thousands	2021		2020		2020
Gross long-term debt	$	983,221	$	961,784	$	962,905
Unamortized debt issuance costs	(7,446)		(7,688)		(7,480)
Carrying amount	$	975,775	$	954,096	$	955,425
Estimated fair value(1)	$	1,104,230	$	1,135,349	$	1,136,311

(1) Estimated fair value does not include unamortized debt issuance costs.

The following table provides an estimate of the fair value of NW Natural's long-term debt, including current maturities of long-term debt, using market prices in effect on the valuation date:

	NW Natural
	June 30,				December 31,
In thousands	2021		2020		2020
Gross long-term debt	$	924,700	$	924,700	$	924,700
Unamortized debt issuance costs	(7,291)		(7,688)		(7,480)
Carrying amount	$	917,409	$	917,012	$	917,220
Estimated fair value(1)	$	1,043,696	$	1,097,188	$	1,097,348

(1) Estimated fair value does not include unamortized debt issuance costs.