Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Schedule of Provision for Income Taxes

The provision for income taxes for the years ended December 31, 2022, 2021 and 2020, consisted of the following (in thousands):

	Year Ended December 31,
	2022		2021		2020
Current:
Federal	$	137,483	$	137,862	$	79,926
State	47,032		47,226		27,401
Foreign	40,204		41,464		20,018
Deferred:
Federal and state	13,542		(22,515)		(9,089)
Foreign	775		1,117		(2,650)
	$	239,036	$	205,154	$	115,606

Schedule of Income Before Provision for Income Taxes

Income before the provision for income taxes for the years ended December 31, 2022, 2021 and 2020, consisted of the following (in thousands):

	Year Ended December 31,
	2022		2021		2020
Domestic	$	780,624	$	676,445	$	378,876
Foreign	116,331		127,335		43,006
	$	896,955	$	803,780	$	421,882

Schedule of Difference of Income Taxes from Statutory Federal Income Tax Rates

The income taxes shown above varied from the statutory federal income tax rates for these periods as follows:

	Year Ended December 31,
	2022		2021		2020
Federal U.S. income tax rate	21.0	%	21.0	%	21.0	%
State income taxes, net of federal tax benefit	4.7		4.5		4.9
Permanent book/tax differences	0.3		(0.4)		0.3
Compensation book/tax differences	0.7		0.7		1.3
Non-U.S. income taxed at different rates, net of foreign tax credits	1.7		1.9		1.7
Federal tax credits	(1.0)		(1.6)		(1.5)
Tax impact of uncertain tax positions	0.1		0.3		0.1
Other, net	(0.9)		(0.9)		(0.4)
Effective tax rate	26.6	%	25.5	%	27.4	%

Schedule of Deferred Portion of Tax Provision (Benefit)

The deferred portion of the tax provision (benefit) consisted of the following (in thousands):

	Year Ended December 31,
	2022		2021		2020
Accrued expenses, deducted for tax when paid	$	41,953	$	(32,741)	$	(33,997)
Internal-use software and capitalized costs	(7,930)		462		1,904
Depreciation	4,608		(2,286)		6,732
Unrealized gains (losses) from investments held in employee deferred compensation trusts	(26,009)		8,167		14,882
Other, net	1,695		5,000		(1,260)
	$	14,317	$	(21,398)	$	(11,739)

Schedule of Components of Deferred Income Tax Amounts

The components of the deferred income tax amounts at December 31, 2022 and 2021, were as follows (in thousands):

	December 31,
	2022		2021
Deferred income tax assets
Employee deferred compensation and other benefit obligations	$	137,501	$	155,064
Deferred revenues, foreign royalties and management fees	3,528		16,034
Deferred payroll taxes (CARES Act)	—		13,355
Credits and net operating loss carryforwards	24,782		24,811
Stock-based compensation	5,262		3,843
Allowance for credit losses	6,765		6,557
Workers’ compensation	3,207		3,623
Operating lease liabilities	46,145		52,614
Other	17,542		18,565
Total deferred income tax assets	244,732		294,466
Deferred income tax liabilities
Amortization of intangible assets	(20,465)		(24,391)
Property and equipment basis differences	(19,756)		(23,305)
Unrealized gains from investments held in employee deferred compensation trusts	(7,992)		(34,001)
Right-of-use assets	(37,618)		(43,986)
Other	(12,104)		(10,549)
Total deferred income tax liabilities	(97,935)		(136,232)
Valuation allowance	(23,571)		(24,198)
Total deferred income tax assets, net	$	123,226	$	134,036

Schedule of Reconciliation of Total Amounts of Gross Unrecognized Tax Benefits

The following table reconciles the total amounts of gross unrecognized tax benefits from January 1, 2020 to December 31, 2022 (in thousands): 

	December 31,
	2022		2021		2020
Balance at beginning of period	$	11,264	$	9,785	$	9,354
Gross increases—tax positions in prior years	1,528		3		220
Gross decreases—tax positions in prior years	(7)		0		0
Gross increases—tax positions in current year	1,533		3,370		1,678
Lapse of statute of limitations	(2,058)		(1,894)		(1,467)
Balance at end of period	$	12,260	$	11,264	$	9,785