Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 172,252	$ 147,159
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	175,313	172,646
Share-based compensation expense	47,950	35,031
Provision for deferred income taxes	(2,829)	10,449
Investment gains	0	(477)
Changes in assets and liabilities:
Receivables, net	(12,301)	(22,774)
Inventory	(7,411)	(296)
Prepaid expenses and other	24,173	(13,681)
Accounts payable	30,118	8,539
Accrued income taxes	21,378	1,105
Deferred revenue	14,768	(42,310)
Other accrued liabilities	(12,977)	(11,885)
Net cash provided by operating activities	450,434	283,506
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital purchases	(75,925)	(49,248)
Capitalized software development costs	(83,550)	(73,855)
Purchases of investments	(321,670)	(39,194)
Sales and maturities of investments	306,935	36,112
Purchase of other intangibles	(7,975)	(9,682)
Acquisition of businesses, net of cash acquired	0	(744)
Net cash used in investing activities	(182,185)	(136,611)
CASH FLOWS FROM FINANCING ACTIVITIES:
Long-term debt issuance	500,000	300,000
Proceeds from exercise of stock options	36,514	118,203
Payments to taxing authorities in connection with shares directly withheld from associates	(4,897)	(4,517)
Treasury stock purchases	(341,715)	(650,000)
Dividends paid	(67,477)	(56,047)
Other financing activities	(5,310)	(3,600)
Net cash provided by (used in) financing activities	117,115	(295,961)
Effect of exchange rate changes on cash and cash equivalents	(3,118)	(7,365)
Net increase (decrease) in cash and cash equivalents	382,246	(156,431)
Cash and cash equivalents at beginning of period	615,615	441,843
Cash and cash equivalents at end of period	$ 997,861	$ 285,412