Debt

9 Months Ended

Sep. 30, 2020

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
	September 30,				December 31,
In thousands	2020		2019		2019
Gross long-term debt	$	962,994	$	906,757	$	886,776
Unamortized debt issuance costs	(7,586)		(6,072)		(5,712)
Carrying amount	$	955,408	$	900,685	$	881,064
Estimated fair value(1)	$	1,118,565	$	997,096	$	957,268

(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
	September 30,				December 31,
In thousands	2020		2019		2019
Gross long-term debt	$	924,700	$	869,700	$	849,700
Unamortized debt issuance costs	(7,586)		(6,072)		(5,712)
Carrying amount	$	917,114	$	863,628	$	843,988
Estimated fair value(1)	$	1,080,663	$	959,906	$	919,835

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