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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net income $ 401,293 $ 321,404
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 82,588 75,120
Net cash provided by operating activities 483,881 396,524
Cash flows from investing activities:    
Additions to property and equipment (22,520) (43,113)
Additions to capitalized software (19,486) (18,640)
Purchases of marketable securities (168,333) (114,407)
Prepayments and maturities of marketable securities 133,895 112,575
Sales of marketable securities 327 842
Other investing activities (11,425) (1,500)
Net cash used in investing activities (87,542) (64,243)
Cash flows from financing activities:    
Payment of contingent consideration (3,965) (633)
Purchase and retirement of common stock (315,811) (327,079)
Proceeds from issuance of common stock 37,902 29,793
Payment of dividends (105,516) (103,914)
Net cash used in financing activities (387,390) (401,833)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (2,442) (4,196)
Net increase (decrease) in cash, cash equivalents and restricted cash 6,507 (73,748)
Cash, cash equivalents and restricted cash, beginning of period 787,727 844,547
Cash, cash equivalents and restricted cash, end of period $ 794,234 $ 770,799