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Gas Reserves (Tables)
 3 Months Ended
Mar. 31, 2020
Gas Reserves [Abstract]  
Gas Reserves
The following table outlines NW Natural's net gas reserves investment:
 
 
March 31,
 
December 31,
In thousands
 
2020
 
2019
 
2019
Gas reserves, current
 
$
14,351

 
$
16,157

 
$
15,278

Gas reserves, non-current
 
172,956

 
171,150

 
172,029

Less: Accumulated amortization
 
127,722

 
109,243

 
123,635

Total gas reserves(1)
 
59,585

 
78,064

 
63,672

Less: Deferred taxes on gas reserves
 
14,522

 
19,638

 
15,515

Net investment in gas reserves
 
$
45,063

 
$
58,426

 
$
48,157


(1)
The net investment in additional wells included in total gas reserves was $3.6 million, $4.5 million and $3.8 million at March 31, 2020 and 2019 and December 31, 2019, respectively.