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Other Balance Sheet Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Cash and Cash Equivalents [Line Items]        
Overnight Holdings $ 471,916 $ 678,512    
Short-term Investments 135,260 90,031    
Cash 24,219 41,047    
Drafts Payable (15,304) (43,694)    
Cash, Cash Equivalents, and Short-term Investments 616,091 765,896    
Client Prepayments Included in Cash Balance (31,300) (36,800)    
Payroll Withholdings Included in Cash Balance 365,900 504,800    
Supplemental Cash Flow Elements [Abstract]        
Restricted cash 48,002 49,779 $ 53,329 $ 46,929
Funds Held for Clients 33,924 34,942 0 0
Deposits workers compensation 180,982 196,370 166,077 185,027
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 843,001 1,013,919 $ 730,275 $ 807,768
Money Market Funds [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 0 0    
Short-term Investments 35,998 33,068    
Cash 0 0    
Drafts Payable 0 0    
Cash, Cash Equivalents, and Short-term Investments 35,998 33,068    
Cash and Cash Equivalents [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 471,916 678,512    
Short-term Investments 99,262 56,963    
Cash 24,219 41,047    
Drafts Payable (15,304) (43,694)    
Cash, Cash Equivalents, and Short-term Investments $ 580,093 $ 732,828