Operations by Business Segment and Geographic Information Operations by business segment (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Schedule of segment reporting information, by segment [Table Text Block]

Information on reportable segments and reconciliation to the consolidated financial statements follows:

	Utility Services		Residential Commercial Services		All Other		Reconciling  Adjustments			Consolidated
Fiscal Year 2023
Revenues	$	934,977	$	754,455	$	4,049	$	—		$	1,693,481
Income (loss) from operations	63,414		71,822		(12,211)		(8,818)		(a)	114,207
Interest expense							(13,745)			(13,745)
Interest income							1,894			1,894
Other income (expense), net							(5,120)			(5,120)
Income before income taxes										$	97,236
Depreciation	$	21,565	$	29,843	$	—	$	2,163	(b)	$	53,571
Amortization	1,873		3,199		—		—			5,072
Capital expenditures	21,716		43,147		—		22,459			87,322
Segment assets, total	399,059		367,745		—		514,256		(c)	1,281,060
Fiscal Year 2022
Revenues	$	840,553	$	666,972	$	3,556	$	—		$	1,511,081
Income (loss) from operations	62,267		58,310		(14,993)		(5,348)		(a)	100,236
Interest expense							(6,129)			(6,129)
Interest income							955			955
Other income (expense), net							(9,863)			(9,863)
Income before income taxes										$	85,199
Depreciation	$	22,791	$	26,294	$	—	$	2,884	(b)	$	51,969
Amortization	776		2,452		—		—			3,228
Capital expenditures	26,178		44,173		—		18,387			88,738
Segment assets, total	362,399		313,401		—		280,421		(c)	956,221
Fiscal Year 2021
Revenues	$	765,072	$	610,666	$	2,315	$	—		$	1,378,053
Income (loss) from operations	73,893		60,261		(27,016)		(5,872)		(a)	101,266
Interest expense							(4,973)			(4,973)
Interest income							175			175
Other income (expense), net							(7,021)			(7,021)
Income before income taxes										$	89,447
Depreciation	$	25,364	$	24,634	$	—	$	2,929	(b)	$	52,927
Amortization	611		2,430		—		3			3,044
Capital expenditures	23,303		36,506		—		15,882			75,691
Segment assets, total	298,070		275,204		—		199,667		(c)	772,941

Reconciling adjustments from segment reporting to consolidated external financial reporting include unallocated corporate items:

(a)Reclassification of depreciation expense and allocation of corporate expenses.

(b)Adjustments to declining-balance method depreciation expense from straight-line method and depreciation and amortization of corporate assets.

(c)Corporate assets include cash, prepaid expenses, corporate facilities, enterprise-wide information systems and other nonoperating assets.

Schedule of revenue from external customers and long-lived assets attributed to foreign countries by geographic area [Table Text Block]

Geographic Information--The following presents revenues and long-lived assets by geographic territory:

	Year Ended December 31,
	2023		2022		2021
Revenues
United States	$	1,594,546	$	1,426,019	$	1,292,496
Canada	98,935		85,062		85,557
	$	1,693,481	$	1,511,081	$	1,378,053
	December 31,
	2023		2022		2021
Long-lived assets, net
United States	$	741,294	$	484,740	$	397,624
Canada	33,086		29,217		27,062
	$	774,380	$	513,957	$	424,686