v3.24.2.u1
Consolidated Statements of Comprehensive Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Operating revenues [Abstract]        
Operating revenues $ 211,714 $ 237,859 $ 645,184 $ 700,282
Operating expenses:        
Cost of gas 72,970 102,433 248,687 308,182
Operations and maintenance 64,950 66,819 138,564 138,636
Environmental remediation 2,329 2,140 8,075 7,515
General taxes 11,853 10,889 27,321 25,108
Revenue taxes 9,211 9,185 27,455 28,227
Depreciation 33,762 31,293 66,860 62,758
Other operating expenses 933 1,257 2,689 2,505
Total operating expenses 196,008 224,016 519,651 572,931
Income from operations 15,706 13,843 125,533 127,351
Other income (expense), net 6 6,618 (1,128) 8,224
Interest expense, net 19,311 18,974 39,842 37,270
Income (loss) before income taxes (3,599) 1,487 84,563 98,305
Income tax (benefit) expense (812) 243 23,527 25,390
Net (loss) income (2,787) 1,244 61,036 72,915
Other comprehensive income (loss):        
Change in employee benefit plan liability, net of taxes 115 0 (134) 0
Amortization of non-qualified employee benefit plan liability, net of taxes 152 103 279 205
Derivative, Gain (Loss) on Derivative, Net 58 1,236 404 825
Comprehensive (loss) income (2,462) 2,583 61,585 73,945
Supplemental Income Statement Elements [Abstract]        
Change in employee benefit plan liability, tax 115   49  
Amortization of non-qualified employee benefit plan liability, tax 55 37 101 74
Unrealized Loss on Derivative, tax $ (22) $ (445) $ (146) $ (297)
Average common shares outstanding:        
Basic (in shares) 38,260 36,019 38,013 35,815
Diluted (in shares) 38,260 36,062 38,059 35,845
Earnings per share of common stock:        
Basic (in dollars per share) $ (0.07) $ 0.03 $ 1.61 $ 2.04
Diluted (in dollars per share) $ (0.07) $ 0.03 $ 1.60 $ 2.03
Northwest Natural Gas Company [Member]        
Operating revenues [Abstract]        
Operating revenues $ 200,188 $ 228,348 $ 622,963 $ 682,861
Operating expenses:        
Cost of gas 73,026 102,490 248,799 308,295
Operations and maintenance 56,751 60,238 122,260 125,627
Environmental remediation 2,329 2,140 8,075 7,515
General taxes 11,305 10,597 26,396 24,597
Revenue taxes 9,198 9,159 27,393 28,134
Depreciation 31,658 29,880 62,765 60,024
Other operating expenses 535 542 1,258 1,239
Total operating expenses 184,802 215,046 496,946 555,431
Income from operations 15,386 13,302 126,017 127,430
Other income (expense), net (430) 3,832 (1,752) 6,277
Interest expense, net 15,336 15,028 31,414 29,639
Income (loss) before income taxes (380) 2,106 92,851 104,068
Income tax (benefit) expense 44 322 25,717 26,744
Net (loss) income (424) 1,784 67,134 77,324
Other comprehensive income (loss):        
Change in employee benefit plan liability, net of taxes 115 0 (134) 0
Amortization of non-qualified employee benefit plan liability, net of taxes 152 103 279 205
Comprehensive (loss) income (157) 1,887 67,279 77,529
Supplemental Income Statement Elements [Abstract]        
Change in employee benefit plan liability, tax 115   49  
Amortization of non-qualified employee benefit plan liability, tax $ 55 $ 37 $ 101 $ 74