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Gas Reserves (Tables)
 6 Months Ended
Jun. 30, 2020
Gas Reserves [Abstract]  
Gas Reserves
The following table outlines NW Natural's net gas reserves investment:
 
 
June 30,
 
December 31,
In thousands
 
2020
 
2019
 
2019
Gas reserves, current
 
$
13,646

 
$
17,206

 
$
15,278

Gas reserves, non-current
 
173,661

 
170,101

 
172,029

Less: Accumulated amortization
 
132,202

 
113,930

 
123,635

Total gas reserves(1)
 
55,105

 
73,377

 
63,672

Less: Deferred taxes on gas reserves
 
13,324

 
26,995

 
15,515

Net investment in gas reserves
 
$
41,781

 
$
46,382

 
$
48,157


(1)
The net investment in additional wells included in total gas reserves was $3.4 million, $4.3 million and $3.8 million at June 30, 2020 and 2019 and December 31, 2019, respectively.