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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income $ 225,866 $ 301,584
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) (43,412) 29,031
Net cash provided by operating activities 182,454 330,615
Cash flows from investing activities:    
Additions to property and equipment (16,470) (19,821)
Additions to capitalized software (18,036) (13,809)
Purchases of marketable securities (48,046) (96,642)
Prepayments and maturities of marketable securities 60,829 90,553
Sales of marketable securities 893 106
Other investing activities (4,979) (2,903)
Net cash used in investing activities (25,809) (42,516)
Cash flows from financing activities:    
Repayments under revolving credit facility 0 (40,000)
Payment of contingent consideration (904) (868)
Purchase and retirement of common stock (156,174) (210,324)
Proceeds from issuance of common stock 32,442 28,849
Payment of dividends (114,829) (109,830)
Net cash used in financing activities (239,465) (332,173)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 6,812 (15,660)
Net decrease in cash, cash equivalents and restricted cash (76,008) (59,734)
Cash, cash equivalents and restricted cash, beginning of period 853,359 831,758
Cash, cash equivalents and restricted cash, end of period $ 777,351 $ 772,024