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Debt (Tables)
 9 Months Ended
Sep. 30, 2019
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
 
2019
 
2018
 
2018
Gross long-term debt
 
$
906,757

 
$
815,534

 
$
741,813

Unamortized debt issuance costs
 
(6,072
)
 
(5,940
)
 
(5,577
)
Carrying amount
 
$
900,685

 
$
809,594

 
$
736,236

Estimated fair value(1)
 
$
997,096

 
$
834,796

 
$
762,335

(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
 
2019
 
2018
 
2018
Gross long-term debt
 
$
869,700

 
$
814,700

 
$
739,700

Unamortized debt issuance costs
 
(6,072
)
 
(5,940
)
 
(5,577
)
Carrying amount
 
$
863,628

 
$
808,760

 
$
734,123

Estimated fair value(1)
 
$
959,906

 
$
833,962

 
$
760,222


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