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Gas Reserves (Tables)
 9 Months Ended
Sep. 30, 2019
Gas Reserves [Abstract]  
Gas Reserves
The following table outlines NW Natural's net gas reserves investment:
 
 
September 30,
 
December 31,
In thousands
 
2019
 
2018
 
2018
Gas reserves, current
 
$
16,392

 
$
16,916

 
$
16,647

Gas reserves, non-current
 
170,915

 
170,391

 
170,660

Less: Accumulated amortization
 
118,937

 
99,835

 
104,463

Total gas reserves(1)
 
68,370

 
87,472

 
82,844

Less: Deferred taxes on gas reserves
 
13,293

 
19,377

 
20,071

Net investment in gas reserves
 
$
55,077

 
$
68,095

 
$
62,773


(1)
The net investment in additional wells included in total gas reserves was $4.0 million, $5.0 million and $4.8 million at September 30, 2019 and 2018 and December 31, 2018, respectively.