Other Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2022

Cash and Cash Equivalents [Abstract]

Summary of investments in cash, cash equivalents and marketable securities

The following table summarizes our investments in cash equivalents and marketable securities held by investment managers and overnight investments:

	December 31,
	2022						2021
(in thousands)	Cash & Cash Equivalents		Marketable Securities		Total		Cash & Cash Equivalents		Marketable Securities		Total
Overnight holdings	$	678,512	$	—	$	678,512	$	490,154	$	—	$	490,154
Investments holdings	56,963		33,068		90,031		88,951		31,791		120,742
Total financial assets	735,475		33,068		768,543		579,105		31,791		610,896
Cash in demand accounts	41,047		—		41,047		47,331		—		47,331
Outstanding checks	(43,694)		—		(43,694)		(50,624)		—		(50,624)
Total	$	732,828	$	33,068	$	765,896	$	575,812	$	31,791	$	607,603

Restrictions on Cash and Cash Equivalents [Table Text Block]

The following table summarizes our cash, cash equivalents, restricted cash and funds held for clients as reported in our Consolidated Statements of Cash Flows:

	Year ended December 31,
(in thousands)	2022			2021			2020
Supplemental schedule of cash, cash equivalents, restricted cash and funds held for clients
Cash and cash equivalents	$	575,812		$	554,846		$	367,342
Restricted cash	46,929			45,522			49,295
Other current assets - funds held for clients(1)	31,732		(2)	—		(2)	—		(2)
Deposits — workers’ compensation	185,027			186,331			175,913
Cash, cash equivalents, restricted cash and funds held for clients beginning of year	$	839,500		$	786,699		$	592,550
Supplemental schedule of cash, cash equivalents, restricted cash and funds held for clients
Cash and cash equivalents	$	732,828		$	575,812		$	554,846
Restricted cash	49,779			46,929			45,522
Other current assets - funds held for clients(1)	34,942		(2)	—		(2)	—		(2)
Deposits — workers’ compensation	196,370			185,027			186,331
Cash, cash equivalents, restricted cash end of year and funds held for clients	$	1,013,919		$	807,768		$	786,699

^[1],[2]

[1] Beginning in the third quarter of 2022, we adjusted the presentation of our Consolidated Statements of Cash Flows to include changes in funds held for clients as a financing activity and to include funds held for clients in both the beginning and ending period amounts in our totals of cash, cash equivalents, restricted cash and funds held for clients. Prior period amounts have not been adjusted to this presentation as the amounts are immaterial to our consolidated financial statements. Previously, the changes in funds held for clients and the related client fund liabilities were presented within operating activities in our Consolidated Statements of Cash Flows. Funds held for clients are held in a trust separate from our company funds and we do not use these funds held for clients for any corporate activity.

[2] Funds held for clients represent amounts held in trust for the benefit of our customers of Workforce Acceleration, our traditional payroll solution, that are restricted for the purpose of satisfying obligations to remit funds to client’s employees and various tax authorities.