Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities:
Net earnings	$ 170,400	$ 225,998
Adjustments to reconcile net earnings to net cash from operating activities:
Provisions for losses on accounts receivable	394	1,072
Deferred income tax expense	2,294	2,036
Stock compensation expense	12,372	12,488
Depreciation and amortization	15,161	15,261
Other, net	1,985	1,159
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(60,542)	508,606
Increase (decrease) in accounts payable and accrued liabilities	83,591	(202,923)
(Increase) decrease in deferred contract costs	(64,062)	67,621
Increase (decrease) in contract liabilities	69,308	(84,447)
Decrease in income taxes payable, net	22,686	91
Increase (decrease) in other, net	3,317	(550)
Net cash from operating activities	256,904	546,412
Investing Activities:
Purchase of property and equipment	(10,181)	(10,126)
Other, net	97	575
Net cash from investing activities	(10,084)	(9,551)
Financing Activities:
Proceeds from borrowings on lines of credit	44	11,495
Payments on borrowings on lines of credit	(17,286)	(26,402)
Proceeds from issuance of common stock	8,029	9,288
Repurchases of common stock	(360,524)	(213,502)
Payments for taxes related to net share settlement of equity awards	(5,185)	(7,445)
Net cash from financing activities	(374,922)	(226,566)
Effect of exchange rate changes on cash and cash equivalents	(14,325)	6,368
Change in cash and cash equivalents	(142,427)	316,663
Cash and cash equivalents at beginning of period	1,512,883	2,034,131
Cash and cash equivalents at end of period	1,370,456	2,350,794
Taxes Paid:
Income taxes	$ 36,864	$ 70,786