Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Net earnings	$ 195,793	$ 382,226	$ 421,791	$ 731,706
Adjustments to reconcile net earnings to net cash from operating activities:
Provisions for (recoveries) losses on accounts receivable	(167)	4,763	905	4,347
Deferred income tax benefit	(3,560)	(8,622)	(1,524)	(11,858)
Stock compensation expense	18,595	25,518	31,083	37,121
Depreciation and amortization	15,506	14,254	30,767	27,229
Other, net	2,564	(1,746)	3,723	(1,291)
Changes in operating assets and liabilities:
Decrease in accounts receivable	174,321	378,291	682,927	245,943
(Decrease) increase in accounts payable and accrued liabilities	(149,986)	(133,171)	(352,909)	7,020
Decrease in deferred contract costs	18,166	37,138	85,787	211,068
Decrease in contract liabilities	(23,803)	(45,574)	(108,250)	(238,931)
Decrease in income taxes payable, net	(93,817)	(93,430)	(93,726)	(47,171)
Decrease (increase) in other, net	4,834	(1,001)	4,284	7,409
Net cash from operating activities	158,446	558,646	704,858	972,592
Investing Activities:
Purchase of property and equipment	(10,481)	(38,158)	(20,607)	(52,570)
Other, net	(794)	(134)	(219)	(55)
Net cash from investing activities	(11,275)	(38,292)	(20,826)	(52,625)
Financing Activities:
Payments on borrowings on lines of credit	(5,743)	(5,382)	(32,145)	(8,484)
Proceeds from borrowings on lines of credit	7,054	33,953	18,549	56,545
Proceeds from issuance of common stock	9,176	5,682	18,464	11,433
Repurchases of common stock	(687,689)	(549,065)	(901,191)	(549,065)
Dividends paid	(102,263)	(109,828)	(102,263)	(109,828)
Payments for taxes related to net share settlement of equity awards	(12,056)	(11,851)	(19,501)	(19,333)
Net cash from financing activities	(791,521)	(636,491)	(1,018,087)	(618,732)
Effect of exchange rate changes on cash and cash equivalents	(7,857)	(46,518)	(1,489)	(52,956)
Change in cash and cash equivalents	(652,207)	(162,655)	(335,544)	248,279
Cash and cash equivalents at beginning of period	2,350,794	2,139,626	2,034,131	1,728,692
Cash and cash equivalents at end of period	1,698,587	1,976,971	1,698,587	1,976,971
Taxes Paid:
Income taxes	$ 173,670	$ 236,791	$ 244,456	$ 314,751