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Segment Information
3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment The following table presents summary financial information concerning the reportable segment and other of continuing operations. See Note 17 for information regarding discontinued operations for NW Holdings.
Three Months Ended March 31,
In thousandsNGDOther
(NW Natural)
NW NaturalOther
(NW Holdings)
NW Holdings
2021
Operating revenues$301,338 $11,012 $312,350 $3,596 $315,946 
Depreciation and amortization26,913 256 27,169 928 28,097 
Income (loss) from operations86,487 8,631 95,118 (412)94,706 
Net income (loss) from continuing operations53,925 6,186 60,111 (594)59,517 
Capital expenditures63,992 106 64,098 1,604 65,702 
Total assets at March 31, 20213,570,153 49,415 3,619,568 139,057 3,758,625 
2020
Operating revenues$278,487 $4,042 $282,529 $2,622 $285,151 
Depreciation and amortization23,946 244 24,190 485 24,675 
Income (loss) from operations75,258 1,763 77,021 (575)76,446 
Net income (loss) from continuing operations47,943 1,236 49,179 (903)48,276 
Capital expenditures56,157 77 56,234 1,212 57,446 
Total assets at March 31, 2020(1)
3,776,650 48,746 3,825,396 160,835 3,986,231 
Total assets at December 31, 2020
3,549,868 49,468 3,599,336 157,043 3,756,379 
(1)     Total assets for NW Holdings exclude assets related to discontinued operations of $15.3 million as of March 31, 2020.
NGD Margin
The following table presents additional segment information concerning NGD margin:
Three Months Ended March 31,
In thousands20212020
NGD margin calculation:
NGD distribution revenues$296,553 $273,561 
Other regulated services4,785 4,926 
Total NGD operating revenues301,338 278,487 
Less: NGD cost of gas112,266 108,595 
          Environmental remediation3,777 4,005 
 Revenue taxes12,655 11,743 
NGD margin$172,640 $154,144