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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net income $ 131,400 $ 107,015
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) (19,106) 7,349
Net cash provided by operating activities 112,294 114,364
Cash flows from investing activities:    
Additions to property and equipment (13,072) (10,640)
Additions to capitalized software (6,277) (9,041)
Purchases of marketable securities (41,650) (21,777)
Prepayments and maturities of marketable securities 32,116 28,387
Proceeds from fixed asset dispositions 1,180 0
Other investing activities (9,931) (3,917)
Net cash used in investing activities (37,634) (16,988)
Cash flows from financing activities:    
Payment of contingent consideration 0 (904)
Purchase and retirement of common stock (46,825) (81,214)
Proceeds from issuance of common stock 45,027 21,364
Payment of dividends (60,359) (57,835)
Net cash used in financing activities (62,157) (118,589)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (572) 2,561
Net increase (decrease) in cash, cash equivalents and restricted cash 11,931 (18,652)
Cash, cash equivalents and restricted cash, beginning of period 834,998 853,359
Cash, cash equivalents and restricted cash, end of period $ 846,929 $ 834,707