Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Current assets:
Cash and cash equivalents	$ 108,556	$ 18,559	$ 19,502
Accounts receivable	50,850	101,495	39,209
Accrued unbilled revenue	16,857	82,169	16,809
Allowance for uncollectible accounts	(2,171)	(2,018)	(2,702)
Regulatory assets	104,830	72,391	80,638
Derivative instruments	62,710	48,130	105,175
Inventories	98,725	57,262	59,997
Other current assets	41,414	59,288	39,551
Total current assets	481,771	437,276	358,179
Non-current assets:
Property, plant, and equipment	4,207,328	3,997,243	3,919,096
Less: Accumulated depreciation	1,166,150	1,125,873	1,112,734
Total property, plant, and equipment, net	3,041,178	2,871,370	2,806,362
Regulatory assets	301,660	314,579	325,071
Derivative instruments	8,008	10,730	24,555
Other investments	96,569	89,278	76,027
Operating lease right of use asset, net	73,145	75,049	75,634
Assets under sales-type leases	135,480	138,995	140,189
Goodwill	74,732	70,570	69,789
Other non-current assets	88,169	56,757	53,419
Total non-current assets	3,818,941	3,627,328	3,571,046
Total assets	4,300,712	4,064,604	3,929,225
Current liabilities:
Short-term debt	141,000	389,500	399,500
Current maturities of long-term debt	50,614	345	278
Accounts payable	118,274	133,486	94,897
Taxes accrued	18,080	15,520	16,558
Interest accrued	11,086	7,503	9,315
Regulatory liabilities	111,551	112,281	164,168
Derivative instruments	19,594	10,402	9,818
Operating lease liabilities	1,361	1,296	1,213
Other current liabilities	39,796	54,432	39,218
Total current liabilities	511,356	724,765	734,965
Long-term debt	1,287,006	1,044,587	916,026
Deferred credits and other non-current liabilities:
Deferred tax liabilities	349,633	340,231	323,925
Regulatory liabilities	663,547	658,332	665,390
Pension and other postretirement benefit liabilities	160,196	166,684	202,287
Derivative instruments	18,824	412	268
Operating lease liabilities	78,469	79,468	79,789
Other non-current liabilities	110,825	114,979	115,114
Total deferred credits and other non-current liabilities	1,381,494	1,360,106	1,386,773
Commitments and contingencies (Note 16)
Equity:
Common stock	$ 786,094	$ 590,771	$ 573,578
Shares Authorized (in shares)	100,000,000	100,000,000	100,000,000
Shares outstanding (in shares)	35,098,000	31,129,000	30,730,000
Shares issued (in shares)	35,098,000	31,129,000	30,730,000
Par Value (in dollars per share)	$ 0	$ 0	$ 0
Retained earnings	$ 345,570	$ 355,779	$ 330,109
Accumulated other comprehensive loss	(10,808)	(11,404)	(12,226)
Total equity	1,120,856	935,146	891,461
Total liabilities and equity	4,300,712	4,064,604	3,929,225
Northwest Natural Gas Company [Member]
Current assets:
Cash and cash equivalents	11,386	12,271	9,697
Accounts receivable	48,082	99,780	37,328
Accrued unbilled revenue	16,649	82,028	16,702
Receivables from affiliates	221	261	628
Allowance for uncollectible accounts	(2,114)	(1,962)	(2,658)
Regulatory assets	104,830	72,391	80,638
Derivative instruments	62,710	48,130	105,175
Inventories	97,633	56,752	59,641
Other current assets	32,605	47,378	29,075
Total current assets	372,002	417,029	336,226
Non-current assets:
Property, plant, and equipment	4,124,488	3,931,640	3,857,652
Less: Accumulated depreciation	1,157,400	1,119,361	1,106,901
Total property, plant, and equipment, net	2,967,088	2,812,279	2,750,751
Regulatory assets	301,596	314,539	325,031
Derivative instruments	8,008	10,730	24,555
Other investments	80,871	74,786	75,991
Operating lease right of use asset, net	73,046	74,987	75,565
Assets under sales-type leases	135,480	138,995	140,189
Other non-current assets	86,661	55,027	52,653
Total non-current assets	3,652,750	3,481,343	3,444,735
Total assets	4,024,752	3,898,372	3,780,961
Current liabilities:
Short-term debt	53,000	245,500	370,500
Current maturities of long-term debt	49,938	0	0
Accounts payable	115,066	131,475	91,947
Payables to affiliates	1,789	1,248	2,568
Taxes accrued	17,914	15,476	16,472
Interest accrued	10,533	7,296	9,258
Regulatory liabilities	111,526	112,281	164,168
Derivative instruments	19,594	10,402	9,818
Operating lease liabilities	1,298	1,273	1,184
Other current liabilities	38,998	53,591	38,642
Total current liabilities	419,656	578,542	704,557
Long-term debt	1,076,533	986,495	857,760
Deferred credits and other non-current liabilities:
Deferred tax liabilities	346,423	337,717	321,636
Regulatory liabilities	662,565	657,350	664,521
Pension and other postretirement benefit liabilities	160,196	166,684	202,287
Derivative instruments	18,824	412	268
Operating lease liabilities	78,436	79,431	79,752
Other non-current liabilities	109,304	113,934	114,438
Total deferred credits and other non-current liabilities	1,375,748	1,355,528	1,382,902
Commitments and contingencies (Note 16)
Equity:
Common stock	614,903	435,515	321,641
Retained earnings	548,720	553,696	526,327
Accumulated other comprehensive loss	(10,808)	(11,404)	(12,226)
Total equity	1,152,815	977,807	835,742
Total liabilities and equity	$ 4,024,752	$ 3,898,372	$ 3,780,961