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Debt (Tables)
 6 Months Ended
Jun. 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
 
 
June 30,
 
December 31,
In thousands
 
2020
 
2019
 
2019
Gross long-term debt
 
$
961,784

 
$
916,832

 
$
886,776

Unamortized debt issuance costs
 
(7,688
)
 
(6,435
)
 
(5,712
)
Carrying amount
 
$
954,096

 
$
910,397

 
$
881,064

Estimated fair value(1)
 
$
1,135,349

 
$
970,205

 
$
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
 
 
June 30,
 
December 31,
In thousands
 
2020
 
2019
 
2019
Gross long-term debt
 
$
924,700

 
$
879,700

 
$
849,700

Unamortized debt issuance costs
 
(7,688
)
 
(6,394
)
 
(5,712
)
Carrying amount
 
$
917,012

 
$
873,306

 
$
843,988

Estimated fair value(1)
 
$
1,097,188

 
$
933,167

 
$
919,835

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