Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Schedule of income before income tax, domestic and foreign [Table Text Block]

Income (loss) before income taxes was attributable to the following sources:

	Year Ended December 31,
	2023		2022		2021
United States	$	99,116	$	90,379	$	89,086
Canada	(1,879)		(5,180)		361
Total	$	97,237	$	85,199	$	89,447

Schedule of components of income tax expense (benefit) [Table Text Block]

The provision for income taxes follows:

	Year Ended December 31,
	2023		2022		2021
Current provision (benefit):
Federal	$	17,708	$	18,795	$	18,101
State	6,275		7,173		7,221
Canadian	(62)		11		78
Total current	23,921		25,979		25,400
Deferred taxes	1,175		(2,070)		(1,652)
Total taxes on income	$	25,096	$	23,909	$	23,748

Schedule of effective income tax rate reconciliation [Table Text Block]

A reconciliation of the expected statutory U.S. federal rate to our actual effective income tax rate follows:

	Year Ended December 31,
	2023		2022		2021
Statutory U.S. federal tax rate	21.0	%	21.0	%	21.0	%
State income taxes, net of federal benefit	5.4		6.1		5.5
Effect of Canadian income taxes	—		(.2)		.1
Nondeductible expenses	.7		1.9		1.5
Stock compensation	(.8)		(.8)		(.9)
ESOP dividend deduction	(.2)		(.2)		(.1)
Uncertain tax adjustments and audit settlement	.1		—		(.5)
Valuation allowance	(.3)		—		—
Other, net	(.1)		.4		—
Effective income tax rate	25.8	%	28.2	%	26.6	%

Deferred tax assets and liabilities, noncurrent [Table Text Block]

Significant components of our noncurrent net deferred tax assets and liabilities at December 31, were as follows:

	December 31,
	2023		2022
Deferred tax assets:
Self-insurance accruals	$	28,198	$	28,183
Accrued compensated absences	2,451		1,931
Accrued expenses and other liabilities	880		808
Accrued stock compensation	4,093		3,298
Foreign tax credit carryforward	1,359		1,569
Lease obligations	21,958		20,938
Intangibles	81		—
Other future deductible amounts, net	5,236		5,988
	64,256		62,715
Less deferred tax asset valuation allowance	864		1,185
	63,392		61,530
Deferred tax liabilities:
Intangibles	—		652
Prepaid expenses	5,874		5,142
Lease right of use assets	21,986		21,177
Property and equipment	29,531		27,731
	57,391		54,702
Net deferred tax asset--noncurrent	$	6,001	$	6,828

Summary of unrecognized income tax benefits [Table Text Block]

The balance of unrecognized benefits and the amount of related interest and penalties at December 31, were as follows:

	December 31,
	2023		2022
Unrecognized tax benefits	$	1,022	$	638
Portion, if recognized, would reduce tax expense and effective tax rate	369		311
Accrued interest on unrecognized tax benefits	47		53

Schedule of unrecognized tax benefits roll forward [Table Text Block]

The changes in our unrecognized tax benefits are summarized in the table below:

	Year Ended December 31,
	2023		2022		2021
Balance, beginning of year	$	638	$	700	$	1,183
Additions based on tax positions related to the current year	436		24		4
Additions for tax positions of prior years	39		—		—
Reductions for tax positions of prior years	—		(8)		(13)
Lapses in statutes of limitations	(91)		(78)		(474)
Balance, end of year	$	1,022	$	638	$	700