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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net income $ 301,584 $ 263,248
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 29,031 61,749
Net cash provided by operating activities 330,615 324,997
Cash flows from investing activities:    
Additions to property and equipment (19,821) (15,469)
Additions to capitalized software (13,809) (12,271)
Purchases of marketable securities (96,642) (81,541)
Prepayments and maturities of marketable securities 90,553 64,194
Sales of marketable securities 106 0
Other investing activities (2,903) (11,000)
Net cash used in investing activities (42,516) (56,087)
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 (210,324) (197,322)
Proceeds from issuance of common stock 28,849 28,867
Payment of dividends (109,830) (105,516)
Net cash used in financing activities (332,173) (277,936)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (15,660) 2,578
Net decrease in cash, cash equivalents and restricted cash (59,734) (6,448)
Cash, cash equivalents and restricted cash, beginning of period 831,758 787,727
Cash, cash equivalents and restricted cash, end of period $ 772,024 $ 781,279