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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net income $ 363,243 $ 401,293
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 65,276 82,588
Net cash provided by operating activities 428,519 483,881
Cash flows from investing activities:    
Additions to property and equipment (32,319) (22,520)
Additions to capitalized software (24,827) (19,486)
Purchases of marketable securities (124,454) (168,333)
Prepayments and maturities of marketable securities 124,040 133,895
Sales of marketable securities 179 327
Other investing activities (2,961) (11,425)
Net cash used in investing activities (60,342) (87,542)
Cash flows from financing activities:    
Repayments under revolving credit facility (40,000) 0
Payment of contingent consideration (868) (3,965)
Purchase and retirement of common stock (266,549) (315,811)
Proceeds from issuance of common stock 35,909 37,902
Payment of dividends (109,830) (105,516)
Net cash used in financing activities (381,338) (387,390)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (26,809) (2,442)
Net (decrease) increase in cash, cash equivalents and restricted cash (39,970) 6,507
Cash, cash equivalents and restricted cash, beginning of period 831,758 787,727
Cash, cash equivalents and restricted cash, end of period $ 791,788 $ 794,234