Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating Activities:
Net earnings	$ 204,099	$ 170,400
Adjustments to reconcile net earnings to net cash from operating activities:
Provisions for losses on accounts receivable	761	394
Deferred income tax expense	76	2,294
Stock compensation expense	11,549	12,372
Depreciation and amortization	14,604	15,161
Other, net	2,291	1,985
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	108,149	(60,542)
(Decrease) increase in accounts payable and accrued liabilities	(18,419)	83,591
Decrease (increase) in deferred contract costs	75,973	(64,062)
(Decrease) increase in contract liabilities	(89,288)	69,308
Increase in income taxes payable, net	30,340	22,686
Decrease in other, net	2,487	3,317
Net cash from operating activities	342,622	256,904
Investing Activities:
Purchase of property and equipment	(13,152)	(10,181)
Other, net	156	97
Net cash from investing activities	(12,996)	(10,084)
Financing Activities:
Proceeds from borrowings on lines of credit	430	44
Payments on borrowings on lines of credit	(235)	(17,286)
Proceeds from issuance of common stock	13,043	8,029
Repurchases of common stock	(177,354)	(360,524)
Payments for taxes related to net share settlement of equity awards	(509)	(5,185)
Distribution to noncontrolling interest	(1,346)	0
Net cash from financing activities	(165,971)	(374,922)
Effect of exchange rate changes on cash and cash equivalents	6,545	(14,325)
Change in cash and cash equivalents	170,200	(142,427)
Cash and cash equivalents at beginning of period	1,148,320	1,512,883
Cash and cash equivalents at end of period	1,318,520	1,370,456
Taxes Paid:
Income taxes	$ 40,624	$ 36,864