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Consolidated Statements of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Operating revenues [Abstract]        
Operating revenues $ 101,447 $ 93,284 $ 566,310 $ 513,406
Operating expenses:        
Cost of gas 25,266 23,741 178,669 173,489
Operations and maintenance 47,329 41,352 149,567 134,256
Environmental remediation 806 867 6,092 6,494
General taxes 9,061 8,656 29,344 26,924
Revenue taxes 3,891 3,555 22,226 19,752
Depreciation and amortization 28,438 25,934 84,679 76,445
Other operating expenses 1,047 767 2,794 2,246
Total operating expenses 115,838 104,872 473,371 439,606
Income from operations (14,391) (11,588) 92,939 73,800
Other income (expense), net (2,216) (3,287) (8,355) (9,902)
Interest expense, net 11,175 9,165 33,329 32,339
Income (loss) before income taxes (27,782) (24,040) 51,255 31,559
Income tax expense (benefit) (7,127) (5,363) 13,117 7,092
Net income (loss) from continuing operations (20,655) (18,677) 38,138 24,467
Income from discontinued operations, net of tax 0 765 0 267
Net income (loss) (20,655) (17,912) 38,138 24,734
Other comprehensive income:        
Amortization of non-qualified employee benefit plan liability, net of taxes 234 186 676 506
Comprehensive income (loss) (20,421) (17,726) 38,814 25,240
Supplemental Income Statement Elements [Abstract]        
Amortization of non-qualified employee benefit plan liability, tax $ 80 $ 66 $ 240 $ 182
Average common shares outstanding:        
Basic (in shares) 30,696 30,555 30,659 30,528
Diluted (in shares) 30,696 30,555 30,708 30,575
Earnings from continuing operations per share of common stock:        
Basic (in dollars per share) $ (0.67) $ (0.61) $ 1.24 $ 0.80
Diluted (in dollars per share) (0.67) (0.61) 1.24 0.80
Loss from discontinued operations per share of common stock:        
Basic (in dollars per share) 0 0.02 0 0.01
Diluted (in dollars per share) 0 0.02 0 0.01
Earnings (loss) per share of common stock:        
Basic (in dollars per share) (0.67) (0.59) 1.24 0.81
Diluted (in dollars per share) $ (0.67) $ (0.59) $ 1.24 $ 0.81
Northwest Natural Gas Company [Member]        
Operating revenues [Abstract]        
Operating revenues $ 96,036 $ 88,367 $ 552,965 $ 502,053
Operating expenses:        
Cost of gas 25,322 23,797 178,837 173,657
Operations and maintenance 43,768 38,657 137,894 126,111
Environmental remediation 806 867 6,092 6,494
General taxes 8,999 8,554 29,041 26,564
Revenue taxes 3,838 3,555 22,143 19,752
Depreciation and amortization 27,719 25,681 82,418 74,857
Other operating expenses 669 725 2,368 2,167
Total operating expenses 111,121 101,836 458,793 429,602
Income from operations (15,085) (13,469) 94,172 72,451
Other income (expense), net (2,295) (4,002) (8,526) (10,744)
Interest expense, net 10,850 8,806 32,336 30,518
Income (loss) before income taxes (28,230) (26,277) 53,310 31,189
Income tax expense (benefit) (7,212) (6,057) 13,628 6,942
Net income (loss) (21,018) (20,220) 39,682 24,247
Other comprehensive income:        
Amortization of non-qualified employee benefit plan liability, net of taxes 234 186 676 506
Comprehensive income (loss) (20,784) (20,034) 40,358 24,753
Supplemental Income Statement Elements [Abstract]        
Amortization of non-qualified employee benefit plan liability, tax $ 80 $ 66 $ 240 $ 182