XML 49 R33.htm IDEA: XBRL DOCUMENT v3.21.2
Gas Reserves
 6 Months Ended
Jun. 30, 2021
Gas Reserves [Abstract]  
Gas Reserves
The following table outlines NW Natural's net gas reserves investment:
June 30,December 31,
In thousands202120202020
Gas reserves, current$8,444 $13,646 $11,409 
Gas reserves, non-current178,863 173,661 175,898 
Less: Accumulated amortization149,011 132,202 141,414 
Total gas reserves(1)
38,296 55,105 45,893 
Less: Deferred taxes on gas reserves8,760 13,324 10,572 
Net investment in gas reserves$29,536 $41,781 $35,321 
(1)     The net investment in additional wells included in total gas reserves was $2.7 million, $3.4 million and $3.0 million at June 30, 2021 and 2020 and December 31, 2020, respectively.