Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Deferred tax assets and liabilities as of December 31 are as follows:

	2021		2020
Deferred income tax assets:	(in thousands)
Allowance for doubtful accounts	$	261	$	258
Accrued expenses	5,452		6,353
Stock-based compensation	36		126
Insurance accruals	11,455		14,283
State net operating loss carryforward	46		—
Indirect tax benefits of unrecognized tax benefits	981		1,037
Other	227		221
Total gross deferred tax assets	18,458		22,278
Less valuation allowance	—		—
Net deferred tax assets	18,458		22,278
Deferred income tax liabilities:
Property and equipment	(87,004)		(98,355)
Goodwill and amortizable intangibles	(20,538)		(18,959)
Prepaid expenses	(887)		(804)
	(108,429)		(118,118)
Net deferred tax liability	$	(89,971)	$	(95,840)

The deferred tax amounts above have been classified in the accompanying consolidated balance sheets at December 31, 2021 and 2020 as follows:

	2021		2020
	(in thousands)
Noncurrent assets, net	$	—	$	8,164
Long-term liabilities, net	(89,971)		(104,004)
	$	(89,971)	$	(95,840)

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Income tax expense consists of the following:

	2021		2020		2019
	(in thousands)
Current income taxes:
Federal	$	25,571	$	10,835	$	14,122
State	7,068		4,472		5,698
	32,639		15,307		19,820
Deferred income taxes:
Federal	(4,392)		736		5,595
State	(1,477)		7,412		(1,204)
	(5,869)		8,148		4,391
Total	$	26,770	$	23,455	$	24,211

The income tax provision differs from the amount determined by applying the U.S. federal tax rate as follows:

	2021		2020		2019
	(in thousands)
Federal tax at statutory rate (21%)	$	22,270	$	19,795	$	20,406
State taxes, net of federal benefit	4,452		5,678		3,561
Permanent differences to return	(227)		446		540
Return to provision adjustment	302		(2,615)		(392)
Uncertain income tax penalties and interest, net	(266)		(73)		289
Other	239		224		(193)
	$	26,770	$	23,455	$	24,211

Reconciliation of Unrecognized Tax Benefits [Table Text Block]

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	2021		2020
	(in thousands)
Balance at January 1,	$	4,937	$	5,010
Additions based on tax positions related to current year	446		767
Reductions for tax positions of prior years	(179)		(216)
Reductions due to lapse of applicable statute of limitations	(533)		(428)
Settlements	—		(196)
Balance at December 31,	$	4,671	$	4,937