Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net earnings	$ 225,998	$ 349,480
Adjustments to reconcile net earnings to net cash from operating activities:
Provisions for losses (recoveries) on accounts receivable	1,072	(416)
Deferred income tax expense (benefit)	2,036	(3,236)
Stock compensation expense	12,488	11,603
Depreciation and amortization	15,261	12,975
Other, net	1,159	455
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	508,606	(132,348)
(Decrease) increase in accounts payable and accrued liabilities	(202,923)	140,191
Decrease in deferred contract costs	67,621	173,930
Decrease in contract liabilities	(84,447)	(193,357)
Increase in income taxes payable, net	91	46,259
(Increase) decrease in other, net	(550)	8,410
Net cash from operating activities	546,412	413,946
Investing Activities:
Purchase of property and equipment	(10,126)	(14,412)
Other, net	575	79
Net cash from investing activities	(9,551)	(14,333)
Financing Activities:
Payments on borrowings on lines of credit	(26,402)	(3,102)
Proceeds from borrowings on lines of credit	11,495	22,592
Proceeds from issuance of common stock	9,288	5,751
Repurchases of common stock	(213,502)	0
Payments for taxes related to net share settlement of equity awards	(7,445)	(7,482)
Net cash from financing activities	(226,566)	17,759
Effect of exchange rate changes on cash and cash equivalents	6,368	(6,438)
Change in cash and cash equivalents	316,663	410,934
Cash and cash equivalents at beginning of period	2,034,131	1,728,692
Cash and cash equivalents at end of period	2,350,794	2,139,626
Taxes Paid:
Income taxes	$ 70,786	$ 77,960