Significant Accounting Policies - Expected Credit Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Current expected credit loss provision	$ 13,624	$ 5,595	$ 1,037
Trade Accounts Receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts receivable, allowance for credit loss, beginning balance	4,154	4,310
Current expected credit loss provision	13,624	5,595
Less write-offs charged against the allowance	9,806	7,163
Credit loss recoveries collected	1,598	1,412
Accounts receivable, allowance for credit loss, ending balance	9,570	4,154	4,310
Trade Accounts Receivable | Electric
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts receivable, allowance for credit loss, beginning balance	375	269
Current expected credit loss provision	1,645	1,325
Less write-offs charged against the allowance	1,994	1,625
Credit loss recoveries collected	388	406
Accounts receivable, allowance for credit loss, ending balance	414	375	269
Trade Accounts Receivable | Natural gas distribution
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts receivable, allowance for credit loss, beginning balance	1,615	1,506
Current expected credit loss provision	5,777	4,084
Less write-offs charged against the allowance	7,355	4,913
Credit loss recoveries collected	1,152	938
Accounts receivable, allowance for credit loss, ending balance	1,189	1,615	1,506
Trade Accounts Receivable | Pipeline
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts receivable, allowance for credit loss, beginning balance	2	2
Current expected credit loss provision	0	0
Less write-offs charged against the allowance	2	0
Credit loss recoveries collected	0	0
Accounts receivable, allowance for credit loss, ending balance	0	2	2
Trade Accounts Receivable | Construction services
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts receivable, allowance for credit loss, beginning balance	2,162	2,533
Current expected credit loss provision	6,202	186
Less write-offs charged against the allowance	455	625
Credit loss recoveries collected	58	68
Accounts receivable, allowance for credit loss, ending balance	$ 7,967	$ 2,162	$ 2,533