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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net income $ 107,015 $ 190,308
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 7,349 70,119
Net cash provided by operating activities 114,364 260,427
Cash flows from investing activities:    
Additions to property and equipment (10,640) (9,283)
Additions to capitalized software (9,041) (6,589)
Purchases of marketable securities (21,777) (49,333)
Prepayments and maturities of marketable securities 28,387 35,397
Sales of marketable securities 0 48
Other investing activities (3,917) (2,000)
Net cash used in investing activities (16,988) (31,760)
Cash flows from financing activities:    
Repayments under revolving credit facility 0 (10,000)
Payment of contingent consideration (904) (868)
Purchase and retirement of common stock (81,214) (100,155)
Proceeds from issuance of common stock 21,364 19,874
Payment of dividends (57,835) (55,503)
Net cash used in financing activities (118,589) (146,652)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 2,561 (5,591)
Net (decrease) increase in cash, cash equivalents and restricted cash (18,652) 76,424
Cash, cash equivalents and restricted cash, beginning of period 853,359 831,758
Cash, cash equivalents and restricted cash, end of period $ 834,707 $ 908,182