XML 53 R36.htm IDEA: XBRL DOCUMENT v3.19.2
Gas Reserves (Tables)
 6 Months Ended
Jun. 30, 2019
Gas Reserves [Abstract]  
Gas Reserves
The following table outlines NW Natural's net gas reserves investment:
 
 
June 30,
 
December 31,
In thousands
 
2019
 
2018
 
2018
Gas reserves, current
 
$
17,206

 
$
16,579

 
$
16,647

Gas reserves, non-current
 
170,101

 
170,958

 
170,660

Less: Accumulated amortization
 
113,930

 
95,596

 
104,463

Total gas reserves(1)
 
73,377

 
91,941

 
82,844

Less: Deferred taxes on gas reserves
 
26,995

 
20,381

 
20,071

Net investment in gas reserves
 
$
46,382

 
$
71,560

 
$
62,773


(1)
The net investment in additional wells included in total gas reserves was $4.3 million, $5.5 million and $4.8 million at June 30, 2019 and 2018 and December 31, 2018, respectively.