CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 107,489	$ 103,483
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, Depletion and Amortization, Nonproduction	21,237	20,284
Stock-based compensation	26,466	25,477
Deferred Income Tax Expense (Benefit)	4,696	14,064
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Increase (Decrease) in Accounts Receivable	17,699	(172,551)
Increase (Decrease) in Prepaid Expense	(11,041)	(41,654)
Increase (Decrease) in Other Current Assets	566	(17,874)
Increase (Decrease) in Other Noncurrent Assets	1,628	(4,324)
Increase (Decrease) in Accounts Payable, Trade	(925)	(378)
Increase (Decrease) in Other Employee-Related Liabilities	(154,403)	(164,247)
Increase (Decrease) in WSEE payroll expense	10,107	253,109
Increase (Decrease) in Health Care Insurance Liabilities	(19,120)	12,642
Increase (Decrease) in Workers' Compensation Liabilities	(2,086)	(11,400)
Increase (Decrease) in Accrued Salaries	(53,413)	(575)
Increase (Decrease) in Income Taxes	(18,537)	6,729
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities, Total	(177,126)	(80,698)
Net Cash Provided by (Used in) Operating Activities, Total	(69,637)	22,785
Marketable Securities [Abstract]
Payments to Acquire Marketable Securities	(32,325)	(17,268)
Proceeds from Sale and Maturity of Marketable Securities	21,560	17,665
Proceeds from Sale of Held-to-Maturity Securities	8,491	0
Proceeds from Sale of Property, Plant, and Equipment [Abstract]
Payments to Acquire Property, Plant, and Equipment	(14,017)	(9,043)
Net Cash Provided by (Used in) Investing Activities, Total	(16,291)	(8,646)
Cash flows from financing activities:
Treasury Stock Acquired	(45,373)	(56,805)
Dividends paid	(41,631)	(37,097)
Other	(2,014)	(2,270)
Net Cash Provided by (Used in) Financing Activities, Total	(84,990)	(91,632)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(170,918)	(77,493)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance	1,013,919	807,768
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance	843,001	730,275
Supplemental Cash Flow Elements [Abstract]
ROU assets obtained in exchange for lease obligations	$ 4,627	$ 2,678

the increase (decrease) during the period in accrued worksite employee ("WSEE") payroll expense

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