Supplemental Cash Flow - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 17,209	$ 18,559	$ 20,084
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	30,035	27,120	28,310	$ 35,454
Northwest Natural Gas Company [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	10,267	12,271	11,488
Restricted Cash	12,826	8,561	8,226
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	23,093	20,832	19,714	$ 15,739
Other Current Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	$ 12,826	$ 8,561	$ 8,226