Operations by Business Segment (Details) $ in Thousands		3 Months Ended
		Mar. 30, 2024 USD ($)	Apr. 01, 2023 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments		2
Revenues		$ 404,809	$ 371,334
Income (loss) from operations		234	11,507
Interest expense		(4,067)	(3,871)
Interest income		526	399
Other income (expense), net		(1,364)	(651)
Income before income taxes		(4,671)	7,384
Segment assets, total		1,281,670	1,004,240	$ 1,281,060
Utility
Segment Reporting Information [Line Items]
Revenues		241,336	224,576
Income (loss) from operations		13,310	16,034
Segment assets, total		369,416	399,853
Residential and commercial
Segment Reporting Information [Line Items]
Revenues		162,850	146,208
Income (loss) from operations		(2,605)	(257)
Segment assets, total		377,319	299,896
All other
Segment Reporting Information [Line Items]
Revenues		623	550
Income (loss) from operations		(7,531)	(4,024)
Segment assets, total		0	0
Reconciling Adjustments
Segment Reporting Information [Line Items]
Revenues		0	0
Income (loss) from operations	[1]	(2,940)	(246)
Interest expense		(4,067)	(3,871)
Interest income		526	399
Other income (expense), net		(1,364)	(651)
Segment assets, total	[2]	$ 534,935	$ 304,491

[1] Reclassification of depreciation expense and allocation of corporate expenses

[2] Corporate assets include cash, prepaid expenses, corporate facilities, enterprise-wide information systems and other nonoperating assets.