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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net income $ 190,308 $ 129,470
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) 70,119 7,103
Net cash provided by operating activities 260,427 136,573
Cash flows from investing activities:    
Additions to property and equipment (9,283) (4,218)
Additions to capitalized software (6,589) (6,360)
Purchases of marketable securities (49,333) (51,524)
Prepayments and maturities of marketable securities 35,397 42,446
Sales of marketable securities 48 0
Other investing activities (2,000) (11,000)
Net cash used in investing activities (31,760) (30,656)
Cash flows from financing activities:    
Repayments under revolving credit facility (10,000) 0
Payment of contingent consideration (868) (702)
Purchase and retirement of common stock (100,155) (71,206)
Proceeds from issuance of common stock 19,874 15,523
Payment of dividends (55,503) (53,127)
Net cash used in financing activities (146,652) (109,512)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (5,591) 1,551
Net increase (decrease) in cash, cash equivalents and restricted cash 76,424 (2,044)
Cash, cash equivalents and restricted cash, beginning of period 831,758 787,727
Cash, cash equivalents and restricted cash, end of period $ 908,182 $ 785,683