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Consolidated Condensed Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net income $ 425,420 $ 341,527
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 1,654 4,455
Net cash provided by operating activities 427,074 345,982
Cash flows from investing activities:    
Additions to property and equipment (27,203) (23,114)
Additions to capitalized software (18,414) (26,584)
Purchases of marketable securities (134,665) (83,968)
Prepayments and maturities of marketable securities 113,801 89,352
Sales of marketable securities 7,546 893
Proceeds from fixed asset dispositions 9,946 0
Other investing activities (8,196) (4,816)
Net cash used in investing activities (57,185) (48,237)
Cash flows from financing activities:    
Payment of contingent consideration 0 (8,799)
Purchase and retirement of common stock (252,889) (236,914)
Proceeds from issuance of common stock 62,835 65,660
Payment of dividends (120,338) (114,833)
Net cash used in financing activities (310,392) (294,886)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 6,941 (1,474)
Net increase in cash, cash equivalents and restricted cash 66,438 1,385
Cash, cash equivalents and restricted cash, beginning of period 834,998 853,359
Cash, cash equivalents and restricted cash, end of period $ 901,436 $ 854,744