Regulatory Matters - Summary of Utilities Rate Plans (RECO) (Details) - RECO - USD ($) $ in Thousands		1 Months Ended	12 Months Ended	23 Months Ended	35 Months Ended
	Jan. 01, 2022	Jan. 31, 2022	Dec. 31, 2016	Dec. 31, 2021	Jan. 31, 2020	Jan. 31, 2016
Public Utilities, General Disclosures [Line Items]
Amortizations to income of net regulatory (assets) and liabilities					$ 200
Regulatory liabilities, amortization period	3 years				3 years
Amortization to income of net regulatory assets	$ 9,200			$ 4,800	$ 25,600
Regulatory assets, amortization period (in years)	3 years			4 years	4 years
Average rate base	$ 262,800			$ 229,900	$ 178,700
Weighted average cost of capital (after-tax) (percent)		7.08%		7.11%	7.47%
Authorized return on common equity (percent)		9.60%		9.50%	9.60%
Cost of long-term debt (percent)		4.74%		4.88%	5.37%
Common equity ratio (percent)		48.51%		48.32%	49.70%
Tropical Storm Henri
Public Utilities, General Disclosures [Line Items]
Amortization to income of net regulatory assets	$ 2,400
Regulatory assets, amortization period (in years)	3 years
Electric
Public Utilities, General Disclosures [Line Items]
Plan electric system storm hardening amount						$ 15,700
Plan period (years)			3 years
Rate Plan for Year 1
Public Utilities, General Disclosures [Line Items]
Base rate changes		$ 9,650		$ 12,000	$ 1,700
Actual return on common equity (percent)	9.60%			5.40%	7.50%
Rate Plan for Year 2
Public Utilities, General Disclosures [Line Items]
Actual return on common equity (percent)				2.30%	5.70%
Period 1
Public Utilities, General Disclosures [Line Items]
Amortizations to income of net regulatory (assets) and liabilities	$ 200
Regulatory liabilities, amortization period	3 years
Period 2
Public Utilities, General Disclosures [Line Items]
Amortizations to income of net regulatory (assets) and liabilities	$ 10,000