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Other Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2023
OtherBalanceSheetDisclosuresAbstract [Abstract] |
Summary of investments in cash, cash equivalents and marketable securities | The following table summarizes our cash and investments in cash equivalents and marketable securities held by investment managers and overnight investments:
| December 31, 2023 |  | December 31, 2022
(in thousands) | Cash & Cash Equivalents | Marketable Securities | Total |  | Cash & Cash Equivalents | Marketable Securities | Total
Overnight holdings | $ | 611,100 |  | $ | — |  | $ | 611,100 |  |  | $ | 678,512 |  | $ | — |  | $ | 678,512 |
Investment holdings | 119,408 |  | 15,905 |  | 135,313 |  |  | 56,963 |  | 33,068 |  | 90,031 |
| 730,508 |  | 15,905 |  | 746,413 |  |  | 735,475 |  | 33,068 |  | 768,543 |
Cash in demand accounts | 26,931 |  | — |  | 26,931 |  |  | 41,047 |  | — |  | 41,047 |
Outstanding checks | (64,566) |  | — |  | (64,566) |  |  | (43,694) |  | — |  | (43,694) |
Total | $ | 692,873 |  | $ | 15,905 |  | $ | 708,778 |  |  | $ | 732,828 |  | $ | 33,068 |  | $ | 765,896 |
Restrictions on Cash and Cash Equivalents | Cash, Cash Equivalents, Restricted Cash and Funds Held for Clients 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) | 2023 |  | 2022 |  | 2021 |
Supplemental schedule of cash and 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) | 31,732 |  | (2) | — |  | (2)
Deposits – workers’ compensation | 196,370 |  |  | 185,027 |  |  | 186,331 |  |
Cash, cash equivalents, restricted cash and funds held for clients beginning of year | $ | 1,013,919 |  |  | $ | 839,500 |  |  | $ | 786,699 |  |
Cash and cash equivalents | $ | 692,873 |  |  | $ | 732,828 |  |  | $ | 575,812 |  |
Restricted cash | 57,403 |  |  | 49,779 |  |  | 46,929 |  |
Other current assets - funds held for clients(1) | 87,219 |  | (2) | 34,942 |  | (2) | — |  | (2)
Deposits – workers’ compensation | 198,170 |  |  | 196,370 |  |  | 185,027 |  |
Cash, cash equivalents, restricted cash and funds held for clients end of year | $ | 1,035,665 |  |  | $ | 1,013,919 |  |  | $ | 807,768 |  |
____________________________________ (1)Funds held for clients represent amounts held on behalf of our Traditional Payroll Solution customers that are restricted for the purpose of satisfying obligations to remit funds to clients’ employees and various tax authorities. (2)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. Please read Note 1. “Accounting Policies,” for a discussion of our accounting policies for deposits — workers’ compensation and restricted cash.

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